I have a 10 gallon tank, with a male "king" betta, and recently went to the store to get a few tetras. In the tank with the tetras was this fish that's barely an inch long and it seemed pretty but not too pretty where my betta would feel threatened so I got it with the tetras...anywho, got home, floated the fish and the longer I look at that fish, the more I realize..that is no tetra. FEMALE BETTA, HELLO!
Well, my male didn't seem too interested in the new fish so I went ahead and let them loose; I had one of my old fish bowls set up just in case and net ready. He swam over and investigated, chased everyone away from his log over in the corner, but beyond that didn't show any interest in the female. The female established her place next to a cluster of plants on the other side of the tank and there has been no fin nipping, just the occasional chase away from eachothers "house". It's been like this for about a week, but I'm wondering if I should go ahead and take her out just to be safe.