Just an FYI.... you may already know this but I figured I'd pass on a little info for others as well:

Buying an octopus is like the lottery. They are bought and sold with such meaningless names as 'brown octopus', 'common octopus', 'Bali Octopus' and a personal favourite 'Octopus Spp.'.

99% of wholsalers/collectors and store owners cannot ID octopus correctly. This is not due to ignorance however as octopuses are incredibly difficult to identify, even after a long time studying the group. They can change colour, body shape, texture and size in the blink of an eye.

With only a 32 gal hex, you're limited to only a couple species that stay small. All of these species are noctural so you'll hardly ever see them... that's ok, but the real kicker is that these species reach sexual maturity in less than 180 days!!! More often than not you'll recieve an adult/late juvenile (if it's even the right species) and will only live for a few weeks to months.

Other, slightly longer lived species such as O. vulgaris and the bimac are good choices if you place them in a larger tank.