| Swordtails and platies are part of the same genus, allowing them to breed together. This is actually how alot of the color variation is developed. Guppies and mollies are part of the same genus too, thus allowing them to breed. However a guppy could not breed with a swordtail for example, although they will try relentlessly. I would say that you could add a few guppies with relatively little problem. Just to let you know though, my girlfriend, with a 29g community, ended up with three male guppies (I don't know how, we know better) who ended up harassing all her other fish until she moved the guppies to my then 55g community. It wasn't much more than a few days before I had lost 2 pregnant platy, and 2 pregnant swordtail. The guppies just chased them to death before we could take the them to the LFS. If you do add some guppies I would recommend 1 male with at least 2 females, or even just females. I know the males look much more colorful but if the males out number the females, no matter what genus, the females will be stressed. |