07-21-2011, 12:03 AM
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Originally Posted by Ami
Scratch that...I just read about the swordtail in the forum. The 20 is too small.
OK, so maybe it's not relevant right now, but if you ever have a bigger tank and still want an answer to your original question -- Yes, you can house platys and swordtails together. They are close relatives, and the conditions they need are quite similar. However, a couple of things to keep in mind: First, because they are close relatives, they can crossbreed, though if they have the choice, they will mate within species mostly. This may or may not be a problem. If you don't care if you get some crosses, no problem, but could be a problem if you want species "purity." Second, either species the males can be territorial and possessive of their "harem" so unless you have LOTS of room, you're better off with only one male and several females of either or both species. Good news, however, is that the male swordtails do not seem to harrass the male platys, and vice versa (at least in my experience).