swordtail platies and any kind of platies, gouramis, guppies, mollies, and tetras are pretty in my opinion...im not saying you can necesarily mix those fish together.....i have with out any trouble, but some people might say that you arent supposed to....you might want to get an albino cory or 2, to help keep the bottom of the tank clean...you probably want to make sure that it is alright to keep them in your tank first, though....i have two in my tank but people have told me that i shouldnt have them in there....so i am no expert.....just some suggestions....good luck with your tank!