I'm thinking of getting a pet octopus. I would like some advise about availability of species , life expectancy, cost and possible pitfalls I could run into. I am willing to put necessary time and effort, but I'm not willing to spend a ton of money for initial set-up. I've never kept a saltwater tank, so I'm wondering how difficult it is. I know quite a bit about octopus biology, but I know little about saltwater tank maintenance. Any advice?