In my 20G I had female platies only, but obviously inseminated before purchase. The fry never survived. When we added more platies with a larger tank and new low-lying piece of driftwood, I let a male in as well and probably pregnant females. It has only been several weeks, and I have got fry. Everyday I see a new one, and they don't look like they will be going anywhere any time soon. I thought the other fish would eat them, but.....! I know that even if I get rid of the male, these girls are gonna keep reproducing like rabbits. Do I have room for a fry eating fish? These things are going to take over my tank. Any advise?