I am using the Ebb and Flow system and have a bad algae prob. I didn't want to risk chemicals to my babies. So I thought of a solution that SO FAR is working. I went to walmart and bought three algae eating fish and put into my water holding talk. The fish eat the algae and poo in the tank. the poo water is pumped to the babies along with my hydro ferts. it's seems to be a symbiotic relationship.