Do pelcos get along with Bettas? Also what size tank do you need for one? I have a bad algae bloom in my tank. I have a split heated/filtered tank with 3 catfish on one side, an algae eater, and the betta. On the other side is a king betta and an algae eater. The catfish arent doing a very good job with the algae. I went to the petstore to get a pelco and they said my tank is too small and to get a different algae eater which I bought but id still like a pelco if possible. I wouldnt mind taking out some of the catfish if I had to.