I may be wrong here, but it doesn't look burned and because there is polyp extension on the pics, I would assume just alot of nutrients in your system and the burn is just coral growth.
IMO, if there was burn, it wouldn't just be on the tips, but on more of the coral colony.
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Setup: 180G DT, 105G Refuge (approx. 300lbs LR, 150lbs Aragonite)
Hardware: Super Reef Octopus SSS-3000, Tunze ATO, Mag 18 return, 2x MP40W, 2X Koralia 4's Wavemaker
Lighting: 5ft Hamilton Belize Sun (2x250W MH, 2X80W T5HO)
Type of Aquarium: mixed reef (SPS & LPS) with fish
Dosing: Mg, Ca, Alk
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