Just wanted to share this. I know that most algae issues are nutrient related and best solved that way, but if you have a large tank and need to remove some filamentous algae, consider a sailfin tang. I had several species of GH type algae and a fair amount of bubble algae established in my tank. My yellow tang would pick at it, but wasn't really removing any substantial amounts. I added a Desjardini Sailfin and can not believe the amount of algae this fish eats. I mean it mowed this stuff down, plus adding a little extra nitrate to the water has help control my phosphates, which was a big part of my issues to begin with. So far a great addition to my tank.