Concentrate your efforts on water chemistry and bugs
1. Alk
2. Rate of Alk change of the day
3. Look for bugs at day and night time
4. Mag Levels - Required to maintan your alk level
5. Calcium to be in the appropriate range
You lighting does affect corals but I dont think causes death. It causes the corals to loose color or gain color - And under prolonged over/under lighting can cause death.
Untill you identify your root cause dont make too many changes other wise it will cause your SPS to RTN.
Are your other corals turning brown or white? If they're turning white (usually with bright fluorescent polyps) they're getting too much light. Browning usually indicates a water parameter problem or too little light.
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