I use ATI bulb on my 55 gallon and right now I'm using 2 blue+, 1 aquablue special, and 1 purple+. which ATI says is 10K-14K. I'm wondering if I should keep that and put a reef brite actinic blue lumi lite strip on id have that run 3 hours in the morning and 3 hours at night. or if I should do 16k-20k with 3 blue+ and 1 purple+. I just want to know what would be the best for sps for color and growth.