Hi! Hope someone can help, I have a 20 gallon freshwater tank with a crazy algae issue. I had the water tested at the local aquarium shop and they said it looked fine. I have a Topfin filter. There is a blue crayfish, a pleco and 2 snails in the tank. I've been leaving the light off to see if it will help and cut back on feeding to everyother day. I just want the water to be clear! Haha any help would be greatly appreciated!