First off, let me say i have ZERO experience with salt water tanks, but i've heard pretty much every thing stated here before... but whats funny/weird is that whenever i look at the LFS' in Hong Kong, most of the shops just have their octopus sitting in a pretty shallow tank (less than 12inches tall), with no lid on top or anything... so i often wonder if they really would make a run for it as quick as people say, or its just the shops in HK just keep scooping them back into the tank every time they make a run for it...