I'm starting to invest in coral frag tank. I have a 55gal tank that is just sitting around and am going to use that as a frag tank. Been doing alot of reading and cant figure out a light for the tank. I know you needainly blue and purple lighting. But cant find a good light for it. The tank is 48 inches long. I haven't figured out if I just need the blue all the time or any other lights besides purple. Can I get some help. I'm an big shopper on amazon and am not trying to spend 300 on a light. Budget Is around 150 max 200. Let me know what is best to buy to grow corals and benefit them more. Thanks in advance