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Looks like O. Mercatoris, and it probably doesn't have too long to live. He will stay nocturnal. The red light might produce a lot of heat, but red is the way to go if you want to view nocturnal octopuses. They do not need a tank larger than 20 gallons unless you plan to keep a group.
Also, if those are Dendrophyllia in there, you may want to reconsider because they could sting the octopus because they have super sensitive skin and that would not bode well. Just something to think about if you have another tank you can put them in.
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