I have a 75 gallon tank with one sevrum, one jack dempsey, and a couple of convicts. I just picked up some chocolate fry, about an inch each and placed them in a ten gallon tank. How quickly do these grow and at what point should I put them in my 75 with my other fish. And how many do you feel I can put in the tank? Right now all the fish get along fine, and only one convict seems to dominate the tank. It is about 4 inches. The other fish are 3 to four inches.