Hi all, I 'inherited' a betta a few days ago, which is to say it was given to my daughter for Easter, in a 'Betta tank". Which is to say a very small tank, with 1 tree planted in it and some purple gravel. There's no filter, no heater, nothing. Doesn't seem like the best of places to keep him to me. So I myself had just started my first tank a week ago as well, by strange coincidence. I have a 20g tank with 3 guppys and 3 swordtails in it. I would like, to transplant the Betta in there once the tank has cycled, but I'm kind of fearful of his reputation. So do these guys tend to fight any fish at all; or just their own kind?