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The problem with having them in a small tank is that they are amazing escape artists and can slip through the smallest of holes. Also as a downer, they typically live only 12-18mos and they can't be bred in captivity, so I eventually gave up the idea.
What intrigues me the most is how a sea creature like the octopus can take advantage of an element that's not even from its domain.
They display extraordinary intelligence for such a 'different' creature. As far as I know their nearest related species is the spider, which also displays a very high degree of aptitude for its kind.
Edit: Here's the story: http://www.telegraph.co.uk/news/newstopics/howaboutthat/3328...
There was a story not long ago about an octopus in a German aquarium. Apparently, the museum noticed that a particular lamp was always broken. With the help of surveillance, they discovered that every night, an octopus in a nearby tank would climb his tank to an elevated position and shortcircuit the lamp by spitting water on it. The lamp had been disturbing the squid's sleep, causing it to take active measures. They…
A cephalopod's ( http://en.wikipedia.org/wiki/Cephalopod ) closest relative is an arachnid? I don't think so.
There was a story not long ago about an octopus in a German aquarium. Apparently, the museum noticed that a particular lamp was always broken. With the help of surveillance, they discovered that every night, an octopus in a nearby tank would climb his tank to an elevated position and shortcircuit the lamp by spitting water on it. The lamp had been disturbing the squid's sleep, causing it to take active measures. They…
They're amazing animals, and really blow away the whole concept of invertebrates not having great intellects.