Molly and Swordtail

[suby7272]

Hi guys

I have today put in a male and a female swordtail into a tank that already has an agressive pair dalmatian sail fin molly in it. Is this inviting trouble ?
Do mollies and swordtails crossbreed ??

Suby

 

[Harlock]

They don't interbreed. You should be fine. As for the aggression, well, who knows. how big is the tqank, what else is in there, how much cover, etc?

 

[suby7272]

thanks for the reply harlock
I suspected the interbreeding thing becoz I noticed that both the males appear same to me physiologically - (similar looking fin-like reproductive organs - I know it's got some name which I dont know )

 

[Kissofthegorami]

Swordtails and platties can interbreed. Mollies and swordtails do not. Too far apart in the genetic line. In my experience keeping these fish, rarely i would have an overly aggresive male swordtail. Male mollies were only aggresive with other male mollies but never to a serious degree. They are both very placid fish. You should have at least 2-3 females for every male molly and sword tail.