I don't have a lot of hair algae. Small patches here and there only on a few little rocks. Saw a margarite snails eating some today. Ill just stick with the water changes. Looking to making a bigger HOB fuge. How big is too big for my 35 gallon. I have a aqua c remora. HOB Skimmer. 2 gallon? Max maybe. I dunno if I would want to add too much weight on the back