20 gallon

Come on now- that's a bad idea not only because they're poisonous, but also rare/somewhat endangered....Maybe a Bimac- I'm not sure of their requirements, but they don't get very large.
 
angelfishlover, there are many species of small pygme octos that are sometimes avaliable that would do good in a 20gal.
 
i would not recommend any octo,or ceph for that matter to a 20 gallon,also bimacs will comet suicide,if you put them in a 20 gallon,there minamum is 55 gallon, no less, and for pygmys 30 gallon.
 
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