Yes! There's such a thing! They've even been bred in private aquariums! This time im serious, the minimum tank size is around 5gals, my public aquarium has them in a 10gal and their laying eggs! They are considered 'common' in the hobby, unfortunetly they only live 8-10 months and they are usually found at adult size in pet stores. My local public aquarium just bred them! Their selling the eggs to other enthusiasts. That was almost a year ago though they might have bred them again by now!
http://en.m.wikipedia.org/wiki/Octopus_mercatoris#section_1
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http://en.m.wikipedia.org/wiki/Octopus_mercatoris#section_1
Sent from my SAMSUNG-SGH-I727 using MonsterAquariaNetwork App