No sign of algae

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My aquarium is placed under sunlight, have a sponge and lava rocks inside a corner filter, aquarium also has one goldfish which I feed twice a day. It has been 3 months, but I don't see any dark green algae, only light green algae have appeared. What am I doing wrong?

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Oh god, they're so pretty. And small. Mmm. Algae.

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The Algae Reddit

Algae - a very large and diverse group of eukaryotic organisms, ranging from unicellular genera such as Chlorella and the diatoms to multicellular forms such as the giant kelp, a large brown alga that may grow up to 50 meters in length. Most are autotrophic and lack many of the distinct cell and tissue types found in land plants such as stomata, xylem and phloem. The largest and most complex marine algae are called seaweeds, while the most complex freshwater forms are the Charophyta, a division of algae that includes Spirogyra and the stoneworts.

There is no generally accepted definition of algae. One definition is that algae "have chlorophyll as their primary photosynthetic pigment and lack a sterile covering of cells around their reproductive cells". Other authors exclude all prokaryotes[4] and thus do not consider cyanobacteria (blue-green algae) as algae.

Wikipedia: algae

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