i want to get a new lighting system for my 46gal bow front. i want metal halide for it i found a fixture tha puts out 480w ,that will give me about 10w per gal in my aquarium ,would that be a prolbem. would that affect any of my coral. still i need to upgrade from my fixture that only puts out 192w only giving me about 4w per gal. so if anyone give me a heads up on that i would appreciate very much so. thanks