I know that an Octopus doesn't like bright lighting, but I have a question. I intend to split my tank so that half has fish and half houses an octopus. I figured I'd just go with a single tube light fixture. But recently, I came across a dual tube 80 watt fixture and a 400 watt metal halide set up. Both are very very very cheap and because they are such outstanding deals, I thought it would be a good to buy them. I realize that the MH is mainly for coral, and at some point, I hope to introduce coral into my aquarium. Will this high intensity disturb the octopus? Also, will the MH light give off too much heat as to raise the temp. of the water?