So just an update. I am still slowly losing sps colonies while others are growing. Some go from the base up. Others burn at the tips. others just melt in the middle.
My frog spawn has stopped growing and does not look that good throughout this process. My palys still grow like weeds. My gsp looks like crap some days and other days looks good.
My fish and clams look great and happy.
Here are some of the latest parameters:
Nitrate .2
P04 .02
Alk 9.3
Calc 378.
PH 8.1
Mag 1320
So as colonies die, my demand for alk and calc drops. The alk has been steady in that range but calc has been slowly dropping. I keep increasing it each week and the demand is a tad higher than the alk so I am not sure what that's about. But non the less it would not be killing colonies.
I do 10% water changes twice a week. This is a new bucket of salt for the past month or so. So that's not it.
Poly filter not showing any metals
PAR of LED's has not changed and the color of the corals is stable so I don't think that is it.
Temp is stable.
Sand bed never gets disturbed
Skimmer is skimming nice black junk. Particularly with my vodka dosing. (problem started before vodka dosing)
I since changed from ESV to BRS two part so it was not a bad batch of that.
I stopped using any supplements in case there was a contaminated bottle.
Nothing new in the house. No construction, no increase in house keeping, no other people in the house, no small children, same other pets, so signs of any pests on the colonies, no new additions in months and even months before this started. System is 3 years old not and has always been very stable.
I am tempted to scrap the entire system and rebuild and recycle using all new rock and sand. I have a 50 gallon frag system that is full of RBTA's and some forest fire digi that grows like a weed but I am hesitant to put any of the old rock into that system. Colonies that I transfer have not been recovering in the frag system. My PAR is quite low and most of my SPS like it around 350 so that may be the problem...