I found that my rtc grows quickest at water temps between 82-84. Currently I'm at 84.5 and he is putting on massive girth. Also it helps if u guys vary Their diet, especially when young. Wat I feed is a random mix of the following: talipia, catfish, salmon, sea perch, scallops, shrimp, perch, earthworms, bananas, frozen peas, kens 9.5mm pellet, algea wafers, massivore(not really anymore) and they get treats such as octopus, squid, crayfish...and soon I'm going to try a mouse. I buy what ever is cheap. If I find a deal at walmart like with salmon recently I'll pick up a few pounds. Try dif places, I go to aldies to pick up bags of cheap fish. China town would be great to. My main staple has always been tilapia but I mix it up as often as possible.