I think the kind of octopus is a good question. You don't have to bolt down the top, just make sure it can't open. They are messy eaters, so you will need to deal with that. I almost got a brown dwarf octo on sat. It was 30 bucks and about the size of your thumb nail. It was in a 1g tank with sps
skeletons for lr
/hiding. We took that little tank apart for 15 min before we found the little guy.