Hey guys... I was thinking about getting a bigger tank. Currently I have a 75 with one 5-6 inch red belly. I was thinking about getting two or three more of the same size. But at 10 or 12 inches when fully grown they will look way to big for the tank in my opinion. So how long will they take to go from 5 to 12 inches? I think they would look awesome in a 125 gallon! Thanks for the help!