Still trying to decide what to do with my 75 gallon tank: peacocks or Tangs? Just when I think I've got it figured out, I get contradictory information. Last week a fish store owner, who shall go unnamed, told me that if I go the peacock route, I should get about 20 fish. I said, well that means massive and frequent water changes, and he said no, one or two WC's a month would be fine. But won't that result in sky-high nitrates? Which would be bad in all sorts of ways, including the fish getting more aggressive. I remarked that I've heard that hybrids like OBs are more aggressive, and he said, no, it's the opposite. Can someone help me sort this out?