+1 on the coral+ bulb. The aquablue special is like a 12k bulb and the coral+ is more of a 14-16k bulb. Plus it still puts out great par. I have a 6 bulb t5 over my tank and I run 3 blue+, 2 purple+, and 1 aqua blue special and I think when I have to change bulbs I will go with the coral+...