Lighting and bleaching - need help ASAP!

lennytheblenny · Jun 29, 2016

I switched about 5 weeks ago to a Kessil A360W on my JBJ 30. Prior to that I had a twin 24" T5 setup with an ATI Aquablue Special and an ATI Blue Plus (24watts).

NEVER had an issue with coral bleaching until now. My red monti and my Hollywood Stunner are really struggling. The monti is completely bleached and now has some brown spots and the Hollywood Stunner chalice is now bleaching along the edges.

Calcium is at 425
Mag is 1500
Temp is 77-78
No detected Nitrates or Nitrites
No ammonia
PH is 8.18

Alkalinity has been a bit low in the 6.9X range but last night I accidently overdosed and it spiked to 11.48 dKH. This was just in the last 24 hours so I don't think this has anything to do with it.

My questions are:

1. Is there an "equivalent" setting on my Kessil that would most closely match the T5 setup I had?
2. I currently run an Apex and obviously have control over photo period/intensity/etc. Is there something I'm missing here?

Here's my current schedule:

Diesel · Jun 29, 2016

You only could know if you had some PAR readings before the switch and after you had your kessil up.
You could lower the intensity of your kessil and try keep a balance on your elements.
From 6.9 to 11.48 is deadly to many if not most corals in less than 24 hrs.
No3 can be at 2 ppm or higher and Po4 needs to be detectable around the 0.04 range.
Do you have a FTS?

lennytheblenny · Jun 29, 2016

Diesel said:
You only could know if you had some PAR readings before the switch and after you had your kessil up.
You could lower the intensity of your kessil and try keep a balance on your elements.
From 6.9 to 11.48 is deadly to many if not most corals in less than 24 hrs.
No3 can be at 2 ppm or higher and Po4 needs to be detectable around the 0.04 range.
Do you have a FTS?

Sure do. From just a few days ago. I guess a water change is due immediately then? Nothing else in the tank is showing any signs whatsoever of stress from the increase in alkalinity.

https://www.reef2reef.com/threads/im-bored-lets-see-your-reefs.220447/page-75#post-3010739