A 7 gallon is too small for any octopus in my opinion. A O.mercatoris might be able to survive if the tank is plumbed to a sump but I would not risk it with in tank filtration on a 7 gallon. And even if you are told you are being sold a O. mercatois, that dose not meen you will get one.
You could very well wind up with a much larger growing species that is only a few months old.
chris
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