I have a newly set up 120 gal saltwater tank. I am looking to buy an LED light. I plan on having coral as well as fish. The tank is 72" long by 24" high. I want to purchase a light that will keep the coral thriving. I am of course looking to do this as least expensive as possible. Any suggestions are definitely welcome. my biggest concerns are light penetrating to the bottom of the tank as well as light spectrum, other than that I am a novice but have been reading a ton.