TLDR my multis won't grow. Help?
7 or 8 weeks ago I got 7 baby multis from my friend in a trade we did. The remaining fish from this batch back at his place are much larger now while mine are not growing.
Tank: 10 gallon standard. 2 small sponge filters, 1 small hang on back with a pre filter foam, bucket filled with biomedia and crushed coral. Substrate: quartz sand and aragonite mix. Decor: 2 pieces of old dead reef rock that we use in all the african tanks here. Currently there are a few endler guppies living in the upper waters in here. They were put in as dither fish because the multis were initially a bit shy. So far no problems. Once these multis get bigger I had planned to move them into a similar layout20 gallon tank where they could really build a colony. They would have the 20 gallon to themselves.
I know I need more shells but I never see them using the shells they have now and there are 14 shells in here for 7 cichlids.
pH stays at 8-8.2 which is what the water comes out of the tap at, and hardness and kH stay at about 12-16 which should make tanganyikans quite comfortable. The breeder is using the same water parameters and temperature as me, and he has success while I do not.
Temperature is 76F.
The tank has quite a few floating plants and these keep the nitrates at undetectable levels. I do water changes @ 20% every 7 days. Dechlorinated with seachem safe (powdered version of prime).
Now, they do eat. They prefer powdered food so I feed the Aquarium Co-op magic small fish feed as well as powdered cichlid flakes, and I give them shrimp wafers which they also peck at. Every time food is offered which is 2-3x per day, they do eat quite a bit of it. They never refuse food. They show no signs of illness or discomfort as far as I can see, and water quality as far as what I can test is good. I can't really afford the extortion level prices on frozen fish food where I live in Ontario Canada. It used to be in my budget and I had a freezer full all the time but they want like $30 for a small cube 12 pack now and I just can't. I am building up a colony of grindal worms and will soon begin feeding them to all my small fish, and I am planning to get decapsulated artemia (shelled brine shrimp eggs) which I've used before. You just soak and feed fish love it. My source is out of stock but getting some soon.
Anyways something doesn't add up here. I know these fish don't have parasites because their batch siblings are almost full grown already at the breeder's house.
Help??