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- Sep 8, 2006
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simple;103575 said:10 foot tank for an octopus with a maximum arm span of 2 to 3 feet (according to: http://www.waquarium.org/MLP/root/html/MarineLife/Invertebrates/Molluscs/Octopus.html ?!? Bimacs get to almost two feet in arm span so if a cyanea needs something that big wont a bimac need something much larger than the recommended 55 gallons?
You're missing the point. Bimacs aren't really all that active in their natural environment. They hide under rocks. The come out to find food, unless it comes to them. They might wander about but they don't venture off far from their den.
Cyanea on the other hand roams around all over the place. Very active. That's where the comparison to the much larger Giant Pacific Octopus comes in. They aren't nearly as active so they are much better suited to being kept in captivity.
Think of it like this... Great Danes and Greyhounds. While a Great Dane is a very large dog, it's very lazy, so a small space is fine for it. A Greyhound on the other hand is a bit smaller dog but needs lots of room to run.
If you want a large diurnal octopus, look for a Vulgaris. But for now, a 110 gallon would be great for a Briareus.