This is a scan of page 282 in Mark Norman's Cephalopods A World Guide. Sadly it is out of print and VERY hard to find. I wish he would update it (copy right 2003) but it is the best octopus reference to be found even now (click thumb to enlarge).
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There are several sources for small crabs on line and eBay is always worth checking but Paul Sachs has been are reliable supplier for years. If you can get him/her to take thawed mysis, by all means, use them. Including crabs, however, is going to be your best primary food. For the mercs, I also used newly killed shore shrimp. O. bocki may be able to catch them live but I found the merc only did this well when young.
There is no need to remove the snails. They work for clean up and if he wants to eat them on occasion, it is fine.
Very nice! Thank you!
Do they bite if I wanna touch? I've seen some nasty bites, to people petting theirs haha!