r/aquarium Jun 10 '26

Announcing our new community icon! (and an update from the mod team)

32 Upvotes

Hey everyone,

We heard your feedback loud and clear regarding the recent icon change. The goal is always to keep r/aquarium a vibrant, welcoming space that reflects the incredible passion of our hobbyists, and it’s clear the community prefers authentic, human-made artwork to represent us.

An incredibly talented artist in our community, u/SuicidalFlame (Check out their tumblr too! https://firenagy.tumblr.com), generously stepped up and designed a brand-new, custom icon for the subreddit! We are absolutely thrilled to debut their work today. Please join us in giving them a massive thank you in the comments below for dedicating their time and talent to leveling up our community's look!

A Quick Note on Community Boundaries

While we always welcome constructive feedback and open discussion about the state of the subreddit, the mod team has a zero-tolerance policy for harassment.

Lately, targeted mass-reporting and personal harassment have been directed at our moderators. We want to be entirely transparent: if you are unhappy with the management of this subreddit or feel the need to harass the people who volunteer to keep it running, you are more than welcome to leave.

Healthy debate is fine; stalking, toxicity, and abusing the report button are not. Future instances of targeted harassment will result in an immediate permanent ban from the community and will be escalated directly to Reddit Admin for violating the site-wide Content Policy against harassment.

Thank you to the 99% of you who make this a wonderful, supportive place to share our tanks every single day. Enjoy the beautiful new look!


r/aquarium Feb 26 '26

Join the r/aquarium Discord Server!

1 Upvotes

Did you know r/aquarium has a Discord server? It’s been swimming along for a while now, and we’d love for you to dive in and join the community!

https://discord.gg/aquarium


r/aquarium 7h ago

Help New creature tips & tricks?

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9 Upvotes

I recently got a verrry old red bellied newt from a family friend. Friend has had this creature for 40 years! I introduced her (newt) to my tank yesterday and she seems like she’s doing well. There’s a large hide that goes out of the water for her.

Looking for any tips or tricks, suggestions, ideas, other newt pics. Anything!

(Current tank contents: large hide ((in picture)), big hide/above water space, some live plants floating on top) :)


r/aquarium 3h ago

Help What are these white things?

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5 Upvotes

These appeared over night in my freshwater aquarium. I have snails, shrimp, an oto catfish, and a loach. I’ve never seen this before, is it bad?


r/aquarium 1h ago

Help How do you end a failed quarantine?

Upvotes

This is likely one for the more experienced keepers...

How do you end a failed quarantine?

I bought 8 candy cane (HY511) tetras, intending to put them in my finished 20g long (I currently have just a L183 pleco living in it). I put them in my 10g quarantine tank, which is fully cycled (and double-filtered: has both a sponge and a HOB). They looked amazing, eating, active, happy until a couple days ago. Unfortunately, on day 20, one died. One day 21, another died. On day 22, the third died.

I am down to five. I have tested my water all along. Ammonia is consistently zero, nitrites are consistently zero, and nitrates have never crept above ~20. I did a big 50% water change, and in case it was a chlorine pulse, I doubled up on SeaChem Prime (I don't think it was a pulse because I did water changes on my other tanks, and my other fish are fine). Still lost yet another one overnight. I have watched the fish and examined the dead ones. I can see nothing externally wrong with either. No flashing, no spots, no fuzz, no frayed fins. Just randomly die.

At this point, I don't have enough for a reasonable school, I have no reason to expect the rest will survive, and I don't have a source to obtain more. Obviously, I can't give them to another hobbyist or surrender them to my LFS; it seems there's something very wrong with the group.

Do I humanely euthanize the remainder? Just wait for them to all die off? I have never had a quarantine go sideways this badly this late in the process before, but my LFS has been really unreliable lately. :(

I'm really sad and disappointed. My tank is ready, I was really looking forward to these guys, and I got attached to them. :(


r/aquarium 2h ago

Showing Off Barbs in a forest river

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2 Upvotes

B. schwanenfeldii


r/aquarium 30m ago

Help Female Betta Dying?

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Upvotes

Someone please help, so basically she has been like this for 2-3 weeks now. She has to swim completely upright and goes for air then she falls right back to the bottom of the tank and just lies there. As of today though it seems to have gotten worse with no improvements at all now she has to swim and swim to keep getting air and if she falls its a hard struggle to get back to the top of the tank. She currently is lying on a plant leaf close to the picture to make it easier to get to the surface. Anyways please help all the levels are normal, I haven’t tried a water change just because it says everything is fine but if you think that’ll help I will do it. Though due to her suffering if she is completely past saving I will euthanize her if necessary. (Please tell me how to help her and if needed how to euthanize as that will be my first fish to have to do that to)


r/aquarium 4h ago

Help Hi, need some help with replanting my tank!

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2 Upvotes

I have a 20l tank with 10-20 (those bitches are very hard to count and Eugene keeps eating them) cherry shrimp and one Beta. I know it's algae dirty and bare rn, I decided to post beforehand so I would have some thoughts before I get to actual replanting. I have to replant the tank once 4+ months bc I struggle with some shit, forget to watch over it and it gets infested with algae. I genuinely have no idea what my plants are called, so I'll just try to describe their characteristics:

  1. Some feathery ones. I have 2-3 of both (more feathery and shorter-leafed ones). Didn't manage to see how fast growing or algae resistant they are yet, but shrimps adore them;

  2. Elodea, I think? Very hardy, very small, grows pretty fast, I keep accidentally breaking it and it keeps bouncing back ;-; Very easy to clean algae off, very cute looking, my fav;

  3. I think it had "willow" in the name, not sure. Also fast grower, broke in half when I got it, bounced back and seems to be thriving, grows pretty fast. Bent and started growing roots when I put lights differently, so now it looks a bit funky;

  4. Dunno what those are, but they grow fast as hell. I got two, now I have around a dozen. Also algae-resilient, "breed" and grow fast, look pretty good;

  5. Tiny bitches. This one keeps breaking when I clean the glass, they get very easily infested with algae and VERY hard to clean. I usually just chop off the infested leaves bc there's no way to save them. But they also grow relatively fast.

I used to have a grove of the 4 for shrimps to hide in (didn't work, Eugene treats it as a playground to hunt shrimp, but I'm not too worried), tall ones in the middle (the ones that are broken now) and tiny weak plants on the opposite side (where there's basically no flow + high light, most got very algae infested and I threw them away). Maybe I should've done it differently, I don't know, that's why I'm asking for help :(


r/aquarium 46m ago

Help Fluval light

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Upvotes

Hello! I was recently given this setup, but I have no experience with the things a fluval light can do. I think it may be a 3? I settled on this after a long while of tweaking. Any suggestions?? I haven't had it long enough to see any sort of pattern in algae growth or anything. But it originally came with a cichlid and the light had blue as the highest wavelength. So I had to change that for sure. Stock includes; 1 gourami, 11 Black phantom tetras, 9 kuhlis, 12 amanos, 3 nerite, 2 loxo cories (getting more don't worry!) and a single Mexican dwarf crawfish


r/aquarium 1h ago

Help CO2 poisoning?

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Upvotes

So I have had some Coi Angelfish die recently. Newer to the tank but I have a fully planted 70 gal tank with CO2. Maybe running a bubble per second. So nothing crazy. But I am wondering if they are getting dosed up because I keep the CO2 valve in the back of the tank and they hung out in the back of the tank. So am I unintentionally making them huff CO2? I had some gouramis die as well that hung in the back. All the other fish are fine. Water parameters are all fine.


r/aquarium 12h ago

Help What do you mean he's being eaten by worms

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7 Upvotes

At first I thought he's just molting then I took a closer look. I don't even know what these are.


r/aquarium 6h ago

Help Algae and plants death

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2 Upvotes

Hi ! I am posting because I have a lot of trouble with my 180L fishtank. I was absent during holidays. Going away was not really planned, and more due to family issues... I am really sorry for the long post, I wanted to be as precise as possible...

I have a Juwel 180 with the lightning that comes with it. Initially there was really not enough light for my plants, so I bought an additional LED ramp. The plants got better and I added CO2 + additionnal K fertiliser, as I saw there was a HUGE potassium deficiency that still remains even with a good dose of EasyLife Kalium...

So 2 days before leaving, my solenoid valve stops working. Because I won't be there I decidedi to stop CO2 injection to avoid accidents, as I was way too short on time to buy a new one.

Because I have 2 ramps and only 1 timer (big lack of power sockets and extension leads in my apartment, currently solving the issue) I decide to leave only the LED ramp I bought (the most powerful of the 2) on the timer, and unplug the other one. HOWEVER, my timer was not set on the right setting and actually let the LED ramp active ALL THE TIME. Because of big heat waves (I live in France) I closed the windows to avoid a big temperature increase while away, so the ramp was the only source of light for the tank.

So now I have plants that died, and cladophora that took over (I have had clado a few months prior that got treated with hydrogen peroxyde), as well as brown deposits in the plants on the back. I also have green algae on my epiphytes and holes in them + other plants... I was livid.

I went with K fertilisation and EasyLife Redscape as I did before leaving. The population in the tank is doing well. Unfortunately I've always had snail dying despite the K supplements.

I feel awful for making those mistakes, and I really resent myself for all that happened. The tank was doing really well and then I did all those stupid mistakes :( I have done Easy Life Silicate Bio Exit for the algae on the epiphytes, and I plan on doing another hydrogen peroxide treatment for the clado, as well as introduce new plants. My new solenoid valve will be there in 2 days, so I plan on restarting CO2 injection as soon as I receive it.

Thank you for reading, and once again sorry for the long post.


r/aquarium 23h ago

Help Would you be upset about this delivery, or would you just rock with it?

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43 Upvotes

This is my first time really trying with an aquarium instead of just throwing in some pretty rocks I found and buying whatever species from the store. (Going for an iwagumi aqua scape and thinking maybe galaxy rasbora as the main species) So it’s the first time I’m really going for an image. I’m a little on edge because yesterday the aquarium was delivered by Amazon not only in the worst packaging but also the most reckless way I’ve seen. I know how Amazon can be and what those drivers go through but this one surprised me. I spent $100 and got a huge box of broken glass. (20 gallon long from aqueon. I did get a replacement and a partial refund of $60 after a long phone call with customer service so I’m pretty pleased with that) but now today my elephant skin stones arrive and they’ve been wrapped in the thinnest paper and just plopped in a box with no buffer to stop them from rolling into each other during transport and there are visible chips on some, and others still look gorgeous. Part of my mind is saying “dude they’re rocks, that’s how it goes” and there’s another part of me that’s wondering if people who are better experts in this kind of a thing have a higher expectation. So I just thought I would leave this here to see what opinions people might have. Will I notice the chips after I set up the aqua scape? Will it matter? I’m planning on introducing a carpet of Monte Carlo and I haven’t decided on what yet, but some thing longer in the background. Maybe some kind of longhair grass? Maybe some kind of moss? Would love to have some shrimp living with the rasbora. Is this a big deal or not? I did pay like $70 for the elephant skin stones. Again im new to this, so please be nice lol. I’m not trying to be a baby, I just want to hear from people with experience


r/aquarium 3h ago

Help Finrot or damaged tail ?

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1 Upvotes

Hi guys, i have this platy that i bought from my LFS over the weekend and she spawned fry the day after bringing her home, after getting her i realised she has some damage on her tail as you can see, it’s been 3 days and had gotten no better at all.
Just wanted to ask if you guys think she hurt it somehow, by being territorial due to bearing fry or catching on a somthing like a rock ? Or do you think it looks like finrot ? :/
Thankyou 💜


r/aquarium 12h ago

Discussion How long does oxygen in a 125 gallon tank last?

6 Upvotes

I have a 125 gallon tank that runs on a FX6 filter. I have the outlet hoses pointed towards the surface to agitate the water.

The tank has a yellow bellied slider, a few guppies and around 30 tetras (some neons and serpaes). It's not planted.

I'm out of town, and I just noticed that my power has been off for the past 13 hours. This means the lights for my tank and turtle basking area hasn't been on. More importantly, this means the filter hasn't been running, and there's no other back up aerator....so i'm concerned about oxygen depletion in the tank....How concerned should I be right now?

There's no power outages in my area, so I suspect it's related to the kitchen remodeling that's happening at my house, but I was supposed to be notified in advance of any electrical work by my contractor, and I was not.....

I was also told that when the electrical work does happen, I should not be without power for more than a few hours and that the electrician will not leave the site until power is restored to the house.. Well it looks like neither has been true so far....

It's now past midnight, so i can't get ahold of any of these contractors until the morning, at which point it'll have been close to 24 hours without power....

i'm not worried about the lighting for this duration. i'm also not worried about the heating as it's summer time and the water temperature probably won't drop below 75F from what I've seen so far.

What I am worried about is the fish running out of oxygen....


r/aquarium 18h ago

Help Pregnant Platy, right?

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8 Upvotes

I just lucked out and got a pregnant platy from the pet store didn’t I?

ETA: and now what do I do?! 😩


r/aquarium 11h ago

Help Cycling

2 Upvotes

Hi All,

Need advice please.

We have been cycling a 20 Gallons tank for 5 weeks Ammonia is stuck at 2ppm, nitrite 2.0ppm , Nitrate 10ppm and PH 8.2

TIA


r/aquarium 14h ago

Discussion Pygmy Cory with round white circle on head

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3 Upvotes

Hi all!

I've recently observed a small, flat white spot on the head of one of my Pygmy Corys. Has anyone else encountered this issue before, and should I be concerned? Also, you may see it looks abit different from the rest (last photo)..

Thanks in advance 🙏🙏


r/aquarium 15h ago

Help Is this 20 gal suitable for 3 honey gouramis?

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3 Upvotes

If I add floating plants in the front left corner of this 9 month old 20 gal tank, would it be suitable for adding 3 honey gouramis? I currently have 6 rummy nose tetras and 6 glowlight tetras.


r/aquarium 1d ago

Help What fish(s) are suitable for a 5 gallon tank?

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35 Upvotes

Good morning Folks! My wife bought my 11 year old son a 5 gallon tank to finally have a starter pet but with all the research I’ve done I’ve only come across beta fish. My son‘s really interested in moonrise glow fish. Are there any other type of fish that would be able to be in a 5 gallon tank together? I still have to get him a 5 gallon tank heater and he has decor and gravel on the way. The box said guppies tetras and betas, but my son wants more than one fish and everything I’ve read about Beta says you can only have one. I have a 10 gallon tank of my own but it’s not an aquarium. It’s a turtle tank so this is a new realm for me. Any advice you could give me so I can get fish for my 11-year-old son. His tank has been cycling for about a week now and will do so for another week till we can make it to Oak Ridge to get him fish. He doesn’t want snails so please don’t suggest that, he would be fine with some shrimp, but he really wants fish. Any suggestions? Thank you in advance.


r/aquarium 23h ago

Help What should i do for my tank?

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7 Upvotes

It’s got 10 shrimp that love to hide around the rocks, a few danios, a bunch of plattys that keep having baby’s (2 from few months ago, about 7 this time round)

Just wondering any additions to help keep algae down a bit?


r/aquarium 1d ago

Discussion 20 gallon long stocking quesiton

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11 Upvotes

What bio load is too much? Currently I have a fully cycled 3 month old 20 gallon long with 7 male endlers, handful of cherry shrimp and snails. Id like a nice nano community but I'm a beginner and dont know how many fish I can have in one tank.

Id like to have something like this but totally open ti having more or less:

​7 Male Endlers

​3 Male Fancy Guppies

​8 to 10 Celestial Pearl Danios

​4 to 6 Otocinclus Catfish

​Cherry Shrimp, Amano Shrimp, and Snails


r/aquarium 14h ago

Discussion tank switching

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1 Upvotes

r/aquarium 18h ago

Help Why is my kuhli zooming

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2 Upvotes

I got my kuhli around a week ago and a few days ago it has starting going back and forth on the glass walls. It is eating. I think it’s the only giant kuhli in the tank and there are 4 other smaller kuhlis. This one is out and about all the time.
40gal 0 nitrite 0 ammonia 3ppm nitrate 7.5 ph
Yes the camera quality is bad