My lfs owner wants to put an octopus in his 180G display. I understand them to be a smart fish and can escape easily, and depending on the species, u could loose a preety big chunk of change if it croaks. Could I get a list of species suitable for a 180, then your top choices? could he keep more than one, if they are a dwarf species? I have no idea of how to care for SW fish, just don't want dan to work this hard to get an octo, just to have it die. can all of them change color?