I kept one once for about 6 months.Awesome creatures.He would get food from my hands.I was the only one though,it was like he knew who was.He would come out if me or my wife came up to the tank and he saw us.If You do decide to keep one You have to really octopus proof the tank,they can get out of the smallest of openings.The one I had went up through the filter overflow and knocked off the top and my wife found him on the floor sadly a dried blob.