Help! All I see is green hair algae all over. My tank has been going for about 4 months and this algae problem is about 2 months in the making. When I first started the tank I used filtered tap water. Since then all my water changes have been with RO. I try to suck it up and last week I did a 15 gallon water change and took all the live rock out and scrubbed it with a tooth brush. My tank looked great for about a week and now the green hair algae has returned! I have a bunch of snails,hermits and a lawnmower blenny but nothing seems to help!. I don't feed much, just a little bit every other day for my 2 clownfish. How else can I rid my tank?