I put a male betta fish in with my 4 eastern newts. The betta seemed to be a beautiful addition to the tank. The arrangement worked fine for several months. Then one day I noticed the betta take a peck at one of the newts. I didnít think much about it, but the next day the betta was pecking viciously at the head/eyes of the same newt again and the newt was swimming to get away. I removed the newt, which, over the next few days developed a bruise-colored head, but did survive. Then the betta started picking on another of the newts, so I immediately removed the betta.