A guy in my general vicinity is selling male bettas. How in the heck have they not killed each other?!?! Everything I've heard is that you dang near separate them at birth. (Hatch, whatever) I've gotten used to the fact that most people on a certain buying/selling website are morons when it comes to fish but this is pretty high up there with the 10" iridescent shark in a 12" tank. (No joke! It was a ten gallon tank!!) So what's the deal with this? Should I be worried? Any clarification would help.