I just bought a mbu puffer. He is about 1 inch long now and in a month i am going to get a 55 gallon tank. I might be able to get a 150 gallon though. I made a mistake by not reading about it before i got it, but i might be able to take it back to my lfs and get a red belly pacu or a nano piranha. Do you think that would be smart or any other fish ideas? Thanks for your time.