im thinking that horn bags might have thrown him off as i looked at it and was like huh? til i thought about it. I just googled mexican fighting fish and yes some people call betta splendens, a mexican fighting fish. as far as the posters question. having the mexican fighter fish would all depend on the size of your tank, and other fish you have in that tank. I get a single male in with the rest of my 55 gallon tank. If your going to do this, which it really isnt recommended, you want to make sure that the other fish dont have long flowing fins like a betta as a betta will see this as another one and want to fight it. also you dont want to keep 2 males together period. now as far as the females if i remember correctly and please someone correct me if i am wrong you need to keep females in a group of at least 3 or just by themselves as they will form a little group and the dominant one will kill another. if you have more than 2 then it has 2 to pick on and they will give each other a break. now keeping the male with the female isnt sugested unless it is breeding time and even then it is fo a short while as the male will kill the female. hope this awnsers your questions.