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STN on the tips.
temp 78
CA 400
KH 10
MG 1550
PO4 .o5
SG 1.026
Nitrate ? I need a new test kit.
Lighting note: about a week ago (after the OT died)I changed from a 400w radium back to a 250w radium.
Side note: I have a few small patches of cyano. I took out the ecobak pellets about a month ago.
( I have tried to cut back on feeding recently)
this sucks.
Its been reported (that that for what its worth) that tipping can come from high alk. For me, 10 is on the high side.
Your bacterial load may also be shifting due to the removal of the Ecoback. Though we don't know much about the bacterial populations, they do seem important for animal health, and when they flux, its seems that bad things like you are experiencing can happen.
One more - this seems to happen annually, around this time. A couple of corals in many peoples tanks just seem to give up. Guesses at what is going on range from coincidence to seasonal changes in make up water (including air born particles from other countries) to almost anything seasonal. The real problem is, you never know if anything you did fixed it or not, you just know it stopped. 
FWIW, i don't change anything unless I find that from testing something is different from last test in response to a single coral going down. They just sometimes do that, and trying to save that one seems to inevitably cause problems for others.
Is it higher from last time you tested? When was the last time you added Mg?
I did add MG on sept 20th and it was a tad low around 1100. I was losing some acans from what I thought was low MG. Back then my oregon tort had some bleaching also.
I slowly brought mag to 1400 by dripping a mag solution in for several days.
this bumped my specific gravity up to 1.027.
I did several 10% water changes a few days in a row with 1.024 salinity.
to get it back down to 1.026.
I'm not planning to change much of anything else for now.
Thanks Rich for your input 
Oh yeah.
PH 7.95-8.05
Hmm, low PH and high ALK.
Not way off, but seems a bit on an unusual combination.
Combine that with Cyano, and it sortof hints to a low flow / CO2 problem.
Hard to say though.
One more - this seems to happen annually, around this time. A couple of corals in many peoples tanks just seem to give up. Guesses at what is going on range from coincidence to seasonal changes in make up water (including air born particles from other countries) to almost anything seasonal. The real problem is, you never know if anything you did fixed it or not, you just know it stopped.
This the first year in a while that I've not experienced this ^^^^^, I've always assumed (the best way to quantify things by the way) that it has something to do with my proximity to the ocean and all of the funky algae blooms that occur between late August and early November.
Although the Eco-Bac removal would be my guess, OTs do not like NO3 IME.
Ha! I had it a little this year, oddly with my OT. It may have been linked to a slight rise in alk though.
Rich,
What do you like to keep your ALK at?
BTW mine was 11 today.
I just turned down the flow of my CA RX to compensate.
Isn't 1550 mg really high?
Mike