I might be acquiring a 90 square 30x30x24,do you think this would be a good home for a bimac( of course after at least 4 months of cycling ).

Normally it's better to have a tank that's longer and wider and not as high. The ocotpus moves over the floor of the tank. However, some do keep their octos successfully in higher tanks (I believe Carol used an octagonal tank for Ink). Since this is a 90 gallon, it would be more than large enough. So yes, you could use it as an octo tank.

I'm glad you're planning on 4 months for the cycling. You should be able to build up a nice supply of amphipods to get your octo off to a good start.

Nancy

which measurement is the height?

sorry I just saw you ?, the height is 24"

Actually, though, my last octopus (we couldn't ever quite place what species it was...there's a picture posted on here somewhere, though) liked to climb up high and hang out more up there than play in her lair. Of course, this was after getting out of the initial shyness stage. So there's something to say for aquariums with height.

I don't think it's a prob if your tank is higher than wide.

just make sure you provide a niece background with hidingplaces at different hights and enough edges and stuff for the octo to explore.

the octo in aquatopia was kept in a high cilindertank. decoration was shaped like a piece of shipwreck. he enjoyed climbing about on that.