Coral has whitish film on some parts, need you help guys

Hi everyone

My coral was doing so well these last weeks from the time i got him from the
beach, now i am noticing some de-coloration on him.
I have other corals in the tank which are doing well.. no sign of stress.
need your help guys.

Equipment:
1) 2 150W MH w/ 14k bulbs
2) MP40 W
3) 1/10 Chiller jbj
4) 100 Gal tan-k w/ 30 gal sump
5) SRO XP 1000SSS
6) NPX Bio pellets

Water Parameters
1) temp 76- 79
2) Ammonia- 0
3) Nitrite- 0
4) Nitrate/PhosPhate- Close to 0
5) Calcium- 500+
6) KH- 8
7) Magnesium- Don't know

Look at the middle part, it has a white-ish look. Checked this morning and it spread more
picture.php
 
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