I have an aculeatus that I currently have in my 20 gal, who I am planning to move into the 55 gal across the living room. The rest of my family is a bit upset by this, because it means giving up the 3 fish who live there, including a honeycomb puffer who has learned to squirt at me, and the trigger who is hand fed. For me it is a no brainer, cephs over fish any day!! My husband keeps on with, "But he (the octo) seems to have tons of room in there." My daughters say, "Aww, we can't give up the puffer." I'm ready to move him ASAP and give the fish to the LFS. What I say goes with animals in our house, but it would be great to have something other than, "Because that's what the experts on the website say!" Any "Top 8 reasons for the bigger tank" lists out there?