Betta is suddenly aggressive?
I have had my betta, Beaker, in my community aquarium for about a year now and until a week ago he was perfectly happy with all of his friends. I have 3 platies, 5 neon tetras, and 5 glowlight tetras in the tank. Now all of sudden he started chasing my platies all over the tank so, I took him out and put him in a 3 gallon tank by himself. I would like to try and put him back in the tank, but I don't know if it is a good idea. I really want to have a betta in my community tank, but since he isn't working out I'm worried about trying another and having that one not work out either. So, should I try my old betta again in the tank, buy a new one for my community, or just not have a betta in there?