I was thinking of getting a bigger tank. I am going to get a 15 gal. tank in brackish water. I am going to use all of my old stuff. Just a new tank. But right now I have two ten gal. tanks one with females and one with males. I don't want them to breed too much in the big tank, since they will all be together if you guys think it will work, because I am already raising a litter of 31 platies. In the big tank I am going to have a male platy, a male molly, two male guppies, a female guppy, and a female molly. Will they breed too much? What if I let the babies stay in the big tank then only some will survive. Is that too harsh?