I posted a while ago about algae eaters and hair algea and have searched some past posts and stickies about algae control. So far a lot of people talk about farawellas being a god send when it comes to hair algae and overall control. But I've found little in the way of aggression info to other fish and conspecifics. I was hoping to get 2 or 3 to control my planted tank algae which is being overrun by mostly hair algae. My pet store has some larger ones for a good price. Algae eaters were cheaper but so small they would just be lunch.
) in a planted 90 gallon with Discus and Cardinal Tetras- they are fine. Once in a very great while I will see a farlo trying to latch onto the side of a Discus, but the Discus just shake them off. Other than that they cause no harm whatsoever.