I need help in dealing with algae. The algae in my tank is not going away for nothing. I have a 75 gallon tank. Water parameters are fine, ammonia is zero, nitrate, nitrite and phosphates are also zero. My lights stay on for 8 hours a day, they are 270 watts. I had put snail, turbo snails, blue leg hermits crabs two sand sniffing star fish, but the algae still there. I would like somebody to recommend me something to do with this problems. The agae is green , brown, and some is red. I think some of it is the hairy alge. I change my water like every month, 30% of it each time. I had put like 40 snails at one time, like 30 hermits crabs, is this enough? I would apreciate any help you might give me.