sick frag?

fatcats

Member
I got a 1in sps frag from a freind about a month ago.I cant really identify it cause he wasnt sure what it was. He was doing alrigh until a few days ago i noticed some white edges around the bottom. I have 2x150w MH on eight hours with 4xT5 bulbs on 11 hours. My levels are all good and I have decent flow. He is about half way down in the tank.
What could be going wrong
Low calcium levels?
Thanks
 
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