Very Frustrated! Am I Over Reacting??

[LeanneP]

I have a 90 gallon tank that I have had running for over a year and about 6 weeks ago I added some frags and a sebae anenome. I have 2 x 250 watt MH and my parameters are as follows:
ammonia-0
nitrate-1
calcium-430
phosphate-0
magnesium-1250
Ph-8.1
temp-79
salinity-1.026
I have an overflow (not drilled) and sump and an HOB Remora skimmer and also two koralia 1050 ghr pumps for flow. I have a third pump but took it out a few weeks ago as I thought I had too much flow.
I have been increasing my lighting gradually with 4 layers of screen above the tank.
I am stressing because one day or hour everything looks great and then suddenly half the stuff is closed up including my nem. I realize things take time to acclimate but today everything looked great this morning and a couple of hours later my hammer coral, mushroom and nem is closed most of the way without any MH lights on. But the frogspawn looks good. Now the lights have been on the side of the nem,it is closing more. I am just stressing for nothing or am I missing something?

Leanne P