FROM WHAT I HAVE HEARD OCTOPUSES ARE VERY SNEAKY AND SMART, THEY ARE AWESOME CREATURES BUT IF I GOT ONE I WOULD BE SCARED IT WOULD ESCAPE. I MIGHT FIND IT ON MY HEAD WHEN I WAKE UP THE NEXT MORNING!!! LOL
the biggest problem is they can fit through ANY whole,, you tank has to be tight with no gaps,, overflows need to be covered, inlets, top need to all be more than secure,,, its very hard to make sure there isnt any escape.
they eat hermit crabs and shrimp. If you can get them eating frozen foods than you can pick up almost anything from the fish section of your grocery store. try going to tonmo.com they have alot of info about octos. look under articles and forums.