Originally Posted by shark bait
It sounds like you have made up you mind prior to even posting this third post on the same issue. So guys don't bash him any more he gets the point, and will do what he wants. Lets give hime some good advice on how one could even keep one in a bio cube. I would even like to see all your ideas on thi as I am sure they will be very diffrent.
Lots of live rock and live sand (2lbs+/gallon), NO corals that might sting the octopus in cramped quarters, ONLY tankmates being a couple brittle stars for cleanup, frequent water changes (aka, 10% every other day), lots of carbon on hand and/or a decent skimmer incase of inking in a small tank, and alot of free time to keep water quality perfect. I used caulerpa to good effect until my octopus decided to rip it all up, when I setup my next octo tank Ill definitely have a refugium to keep those nitrates down.
A major problem with keeping octopus in small tanks is that they are active, high bioload predators that also need PERFECT water quality. My octopus would stop feeding and become sluggish if nitrates were detectable, and keeping ammonia, nitrites, and nitrates at 0 in a small tank in the presence of an active predator can be a challenge for the best of us. And that goes double if you have an inferior setup (for example no skimmer or little live rock) and/or are relatively inexperienced.
Jon