Ihave had my tank set up for about 6 months and want to replace the lights I have ,was told to switch bulbs about every six months. Right now I have A regular daylight and a blue light I was wondering if a 10,000K light would be good plus a blue light. My tank is a 20g FOWLR I have quite a bit of corraline algae growth which I would like to enhance and I have two little bright pink nubs that popped up on one of my rocks someone at one of our lfs told me it was probably a form of coral. Any suggestions??