I am in the planning stages of building lighting hoods for my 2 tanks, a 75e and a 92 corner, I am getting them both ready at the same time, but will start cycling the 75 first, I have been reading all of the older forums getting lots of great info, and have made my mind up to go with metal halide lighting, 2 X 250w for each tank, it looks like to add actinic bulbs, would 4 X 65w actinic bulbs be sufficient?? i am not too worried about cost, just want it to be the best lighting i can get. My main question is " is the blue led lighting that is to simulate moonlight working?? Is it just for looks? (it does look cool, and if it does nothing else, i will still do it) or does it really help the corals and promote breeding in fish and corals?? Has anybody had any success with them? What I am thinking for both tanks, is 24 5mm blue leds, each one at least 4000mcd, 465-470nm. Would it be better to go for a higher mcd rating?? say 6000-7000mcd??? not sure if the 4000mcd is the closest spectrum to moonlight? don't want to overdo it. Thanks in advance!