I have algae growing on the inside of the tank. The water is clear once I clean it off the glass but I have to clean it off every single day. Nitrate and Nitrites test at near zero so I can't figure it out. I don't want to use an algaecide because I do have snails. The one cool thing is getting to see the snail trails up the sides every day but I could still do without. Any help would be appreciated.