I have a 20 gallon tank with 3 ACF. 2 females and 1 male. They are doing well. I have had them for about 3 months. No heater in the tank. Room temp.....water is 72 to 75 degrees. The past two weeks there has been a lot of algae on the sides of the tank. I am cleaning weekly with 20% to 25% water change. Why algae?
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