So about a month and a half ago I purchased a male BETA. He was lonely so I upgraded to a 10 gallon tank (suggested by fish store) and purchased 2 red platys to keep him company....Initially he was not impressed but it gave him some life. NOW I have a problem. The red platy I thought was a male is a female, and vice versa for the other one whom I thought was female and is male. Now my female have a large "growth" on her belly and its turning black...however I'm not sure if that FOR SURE means she is pregnant, although she is eating like a maniac....what do I do, how can I tell?If she is pregnant, I want to keep the babies alive but dont want a tank take-over of red platys...