Chemistry or Lighting

[Daryl.h]

All, I'm battles some bleaching issues and I'm not sure if lighting or chemistry . I know my Ph runs a little low 8.05ish most of the time and I just learned that my MG is really high. The bleaching has been slow, so my first thought is my lights are too low (Photon V2 maxing at 55 blue and 30 white). Then I got to thinking that we just started dosing 9ml of Fusion 1 and 2 a month ago, so maybe that is playing a role. Currently level are....

Temp: 78 - 78.5 - Per Apex
Salt: 35.7 - 35.1 - Per Apex
pH: 7.97 - 8.05 - Per Apex
ORP: 392 - 401 - Per Apex
KH: 11.5 dHK - Per Red Sea Test Kit
Ca: 500 ppm - Per Red Sea Test Kit
MG - 2700 ppm - Per Red Sea Test Kit
NO3: .5 ppm - Per Red Sea Test Kit
PO4: .04 ppm - Per Red Sea Test Kit

This is our green monte, it has seen the most color change.

 

[RJ Harris]

To me your mag alk and cal seem high especially the mag but I don't think that would cause bleaching

 

[Jdavison911]

I think you need to move that acro up.

 

[jwshiver]

If Your NO3 is 0.5 then I would say your alk is too high. I would drop your dkh to 7.5 or raise your NO3.

EDIT: I'm not familiar with the type of lights that you are running, but if they are set at a high PAR with that low of NO3 and that high of dkh you will cook your corals. That has been my personal experience. I would personally slowly raise the nitrates to at least 2 to 5 and let the dkh fall on its own to 7.5 to 8. It will probably take a few days to come down. When it comes to alkalinity changes, Slow = Good, Fast = BAD!!! Give it a few weeks and see what happens.