I have a smooth skin acro that I noticed some "sun spots" if you will. Base is a liter green and new growth is white/blue, my question is I noticed some spots that are very small but noticeable. No bugs, no coral with long sweepers ( I check at night). Sits slightly above halfway up the tank in a 210 with 8 bulb ati fixture. Thoughts? I just moved it down in the tank thinking maybe to much light? Still growing and great PE at night.