I have heard flagfish eat hair algae, and that I have a fair amount of in my planted tank. My LFS has them on sale for 6 for $5, so I was thinking of picking up 6-12 for my 55 gal planted. They would be a solution until my CO2 unit and lights have finally allowed my plants to outcompete the hair algae. Been a struggle, but I think some of these guys could help put my algae out of business.