Me and my boyfriend were at a pet shop and saw an octopus - and we really want to get one... but I can't seem to find a lot of information. The one that we saw was about 8 inchess or so long, whitish/brownish in color and very active -the owner of the store also said that he comes in blue and red. He told us that a tank approximately 12 gallons would be good enough. He also told us that they live for 7 or 8 years. This doesn't seem to match with the information that I've been able to find on the net - but at the same time the guy seemed to really know what he was talking about and the pets in his store seemed very well taken care of. I would like to know if what he told us was realistic, especially regarding the lifespan and the tank size. That and any other advice wold be very welcome. Thank you so much in advance!