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Thanks Starvos, the article would be a good thing to examine for keeping some of the exotics but I was hoping for more of a preference definition for octos. I have noticed that the octos I keep will remove the argonite from their den areas if they choose a ground level den (and have two rather humerous videos of sand rearrangement by senescent animals) and was hoping for a substrate of choice type article. I might have to experiment with a bare bottom tank to see if an octopus would be out more offen without sand - you have definitely started me thinking . I wonder if I can clear a section of Little Bit's tank