When I first got my 2 many months ago, they had a tendency to nip the fins of the other fish (or at least it seemed - i never actually caught them, but I did know of their tendencies). Eventually, I gave them to a friendly LFS, but began to feel sorry for them, and asked for them back. Since rejoining the tank, they've been the perfect angels, but spend most of their time hiding and sulking amidst the foliage, only coming out at worm feedings.