basically i have kept bettas before, and decided to buy one the other day since i have not had one in around two years. he went into my community tank on the thursday, & everything seemed fine. i then stayed away for the night on saturday (and left mother in charge to feed the fish) and when i had came back his lovely blue extremely long fins had been shreaded! he looked like a female! i had an idea it maybe the kribs but i'm not sure... if anything i thought he was going to pick at the guppies i have. i had since popped him into a smaller tank with a lil treatment for fin rot to stop any infection or incase it is this.. but all my other fish seem fine.. any ideas?