best thing for mowing down hair algae....
get a big one. ive had 2 small ones (that i never saw eat any thing and finally vanished into thin air
) and ive had 2 big ones (around 5 or 6 inches long, both mowed down the forest of hair algae that had grown). make sur all your pumps and power heads have a protector so that the sea hare cant get into it. mine did and when i pulled it out it inked, like a squid or octopus.....lol. it lived, i must have just scared the ink (lol) out of it :hilarious .