I have a 75g community tank with 1 Krib, 1 Rainbow Shark, 6 Australian Rainbowfish, 1 Opaline Gourami, and 4 Peppered Corys. I know Tiger Barbs are aggressive and fin-nippers but I've heard that if they're kept in schools of 6 or more they won't harass other fish. So what do you think?