Im thinking about getting a bimac. My plans right now is to get a 40 gal tank. The tank i want to buy has 3 different lights, vayering from dim to bright. im also going to get a protein skimmer (I don't know what size, any recommendations?), I have I fish store near my house and one of the owners has had an octopus, and he said he can supply me with the food. I'm not exactly sure how to set up my tank, I know to put sand and a lot of hiding places though. Is there anything else I need or is this fine?