I've read most of the articles I can get my hands on, but maybe someone can give me a concrete answer. I have a pgymy octopus right now, and I'm trying to find out what lighting would be best. Right now I have a 18w blue actinic pc bulb over him which produces a dull/somewaht dark light, but enough that he hides out most of the time. It switches off every 12 hours and then the party begins! So my question goes like this: What would be the best lighting scheme for the octo (forget my viewing pleasure). Does he need light to set his nocturnal behavior or could I leave the tank dark most of the time?