I really want a puffer for my 180 aquarium and the only ones i found that can really live with other fish are sap but i cant find any. So ive been reading on here that mbu puffers have worked with other fish and have only killed on accident. So i guess my question is how long to you think An mbu would be able to live in a 180 before having to upgrade? Ive been planning my upgrade for a while but it might be about two years before i upgrade to the 480. Any help is appreciated. Thanks