Help chalice coral ends turning white and brown

[Aqauclear]

You need to work through potential problems. Make sure your source water is zero tds/ doesn't have chlorine or chloramines in it. Double check salinity. What type of light do you have, did you actually check your par? Have you stabilized cal, alk, mag in the appropriate range? Are your corals getting enough flow? What is your tank temperature, is it reasonably stable?

magnesium is at 1470. Calcium at 420 ppm. alk at 15 dkh. Phosphates at 0.01 . Nitrate at 2 ppm my ro di water has a tds of 0-3.
salinity at 1.023 temperature 79. 7 f. I have a powerhead with 250 gph and a fliter with 300ghp.
The manufacturer said my lights has a maximum of 120 par by itself, I added a tap water conditioner to my water just now also my damsel is picking on my chalice

 

[Aqauclear]

Had a ammonia spike cause of red sea nopox, chalice didn't make it , duncans and all my others corals are doing much better now after the tank crash.