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I was at my local fish store today and I noticed he had an octopus for sale and I was really thinking about getting it for my nano tank the octopus is only 2 inches big so it would have time to grow
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What @Tuffyyyyy said. Most octopuses have a maximum lifespan of 3 to 5 years, and that's with perfect care and conditions. Most in captivity only live 2-3, and the pygmy octopus has a notoriously short life. You really can't expect them to live longer than two years and most are a year or so old when they arrive in the LFS. So you have a year with your octopus, absolute best case scenario.
These animals are short-lived and require a lot of care. It's not impossible to keep one, just know all this going in, and know it's going to be a challenge.
Curious as to the specific type that lives 3-5 years?
I have captured and raised a few Octopus bimaculoides one of most commonly available in the hobby and they do not live any where close to 3 years, not because of husbandry but that is their life span.
To the op, an Octopus sounds cool but they really do not belong in nano tanks, they will escape through even the tiniest of holes. They will eat all fish and inverts housed with them eventually.
Keeping Octopus is not like keeping fish, they really need a designated tank. Being highly intelligent means you can not just expect them to thrive in the same conditions you would house other inverts and fish. Keeping Octopi is more like keeping a cat.