Yeah he swims most of the time. he will pause from time to time and hovers. The reason I wondered as to what he was is the fact that he is very aggressive and eats everything that happens to be in the tank with him be it smaller than him or be it larger than him. He will not eat any fruit I have put in his tank or the algea tablets. He is starting to get some teeth in they are still just tiny but they seem to be very sharp.