Hello my name is mike, And me and my dad would like to get a species of dwarf octopus for are 29 gallon biocube. I understand there very hard to take care of as of right now i have 1 mandarin dragonet goby in my 29 gallon bio cube i have had it running for about 9 months my levels read. Ph - 8.2 Ammonia - 0 Nitrites - 0 Nitrates - 0 Salinity 1.023 to 1.024 probably about between them I would also like to now what exactly i have to block off in the bio cube, it has a heavy lid on top covering all holes so i dont think he can get out if i do get one. Let me now guys if u think we can do it please specify what kind of species will be small and not outgrow the tank or atleast not outgrow it very fast. I understand that all octopus species dont live past 6-12months is this correct? I used to have a 55 gallon reef tank with clowns and tangs for 2 years so i do have experience in saltwater im not a newbie i dont think so tell me what u guys think i allso do not have any corals that can sting him just mushrooms leather corals zoanthids and some star polyps ill probly end up getting aussie corals.