Hamilton makes a 36” double halide fixture but it is expensive. If I were to purchase one which wattage bulb would work 175 or 250 my tank is 18” deep to the top of the sand and do I need some form of actinic light to go with the halide. I am just worried if I get 2-250W MH and 2 actinic VHO that it might be to much light if there is such a thing. Is their any type of coral that this wood be to much light for? I plan on keeping clams.