since you're being assaulted with a variety of advice, I'll add my $0.02 . . . I've controlled hair algae with just a very few added fish, specifically Siamese Algae Eaters (SAEs) . . .
plecos don't do squat for hair algae, though some snails might help . . . and while I do agree with Lupin that adding to the bio-load is potentially a bad idea, a small school of SAEs (4-6) would have minimal impact in your tank
you don't need "A LOT" of fish to control this problem, and besides, eventually the problem would be solved, and you'd have all those now un-necessary fish in your tank
plecos don't do squat for hair algae, though some snails might help . . . and while I do agree with Lupin that adding to the bio-load is potentially a bad idea, a small school of SAEs (4-6) would have minimal impact in your tank
you don't need "A LOT" of fish to control this problem, and besides, eventually the problem would be solved, and you'd have all those now un-necessary fish in your tank