I was at Petco and saw these guys. I've considering setting up a 20 gallon tall (possibly 30 gallon) and moving my 3 cories, male betta, and 2 ghost shrimp to it once it cycled. I've been looking for a schooling fish that would do well with all these tank mates and be happy in a school of 3-4 in 20 gallons. My water runs pretty alkaline, usually around 8.2, but stays stable. It will be fairly heavily planted, so hopefully hiding spaces and ammonia shouldn't be much of a problem. I checked aqadvisor just as a general guide and it said 3 swordtails on top of my current load in a 20 gallon might be cutting it close. If it is, I'd be more than happy to track down a 30 gallon rather than the 20 and maybe add 2 more cories on top of the swordtail school. I know people have had luck keeping Bettas with platies, but I wasn't sure if the fact that they were swordtails would make a difference.