Are my lights to strong

[Keith Russell]

My corals are losing color my stylos and other corals are turning brown. I thought it was phosphates but my phosphates are in order. I was looking at the manual for my black box LEDs and it says with the lights being 12” above the water surface about 6 “ inches below the water surface, the par would be 500. My stylos are there. They used to be purple. Now they are almost white. And other corals are turning brown. Could this be a light issue. All my other chemistry is perfect.

 

[DSC reef]

Without a par meter you will never know what par your getting at any given depth. A lot of variables with chemistry as well that can cause some issues that your experiencing. I don't have any black box experience so I'll bump for you. @saltyfilmfolks @Flippers4pups