Octopus care

I hVe been very interested in octopuses lately, and was wondering if a former owner could pm ,e all the info about them or post it on here!
How big of a tank? Any special requirements I need for them? I know they can escape easily, I can use turf for that. I know there is a nocturnal breed that you only see late at night. Any breed I could see and enjoy during the day too? ANY information would be great, I'm really looming into them.
 
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