I have 4 in with a bunch of tetras, clown loaches, and apistogramma cichlids, no problems at all, they've been going for years even, and they are great little workers behind the scenes, unlike most algae eaters these ones seem only interested in algae too - not other food you add in to the tank. Tiger barbs are renowned fin nippers though so you might want to find someone who has them in together. Is it a heavily planted tank?