I found a male betta today that was an awesome looking fish. My LFS had him in a 20L because he wasn't doing well in a 5 and seemed to do better in a bigger tank with cories. I put him in my 55 with some cories, lemon tetras, german blue rams and three angels. There is plenty of plant cover and hiding spots. If it doesn't work I have a cycled 5 he can go in. He is black with white fin tips. I'm not really into bettas but he looked so cool I had to buy him. I was wondering if the tank is too big or the other fish won't work with him.