I use carbon and a phosphate remover in a reactor. I have two of my powerheads close to the waters surface to break the water and make ripples. If I just have one on the film starts to form on one side of the tank. I do have a reef ready aquarium so the overflow helps to eliminate the scum on the surface. I also use a protein skimmer and have Chaetopmorpha algae in my refugium. The tank cycles 10 times through the sump/refugium and the water in the top tank moves at 33 times the total volume. |