02-20-2013, 07:15 AM
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Tiger barbs are aggressive fish, although they'll behave in large enough schools. They get pretty big, and I'm pretty sure you can mix all three color variations in one school (normal, albino, and green.. there may be others too) and they'll be fine since they're the same species. So that'd give more visual variety while still keeping the fish happy.
Also, if you do decide to get rummynose tetras, I wouldn't suggest less than 9. I know others on the forum will say the same. Mine were pretty unhappy with jut 7, seemed better with 9 and when I bumped it up to 11 they perked up even more. With a 75gal you could easily keep this large of a school. Amazing fish btw, they do actually school together more than most fish I've seen, even without predatory fish in the tank.