I live in Southern California, and I've been keeping wild caught bimacs for two years. I just discovered that O. micropyrsus, a species of dwarf octopus, lives here too. I've been able to learn that they live in the holdfasts of giant kelp, that their mantle size id 2-2.5 cm (legs 2.5-3 times that) and that they lay surprisingly large eggs (10-12 mm). It would be interesting to set up a tank for them, and maybe even breed them. Does anyone know anything about keeping them? A giant kelp holdfast is not something I'm going to be able to keep in my aquarium, and I'm not sure how I would simulate that environment, so any clues about how to successfully keep these guys would be helpful. Are they diurnal?