Update: apparently after you stuff 60+ corals into a relatively small tank, you reach a point where you can only dose by hand so much before the corals get stressed. I reached that point about 6 weeks ago. I was doing a 12ml dose twice a day for alk and 10ml a day on calc. Those swings and perhaps the high alk that mixes with red sea coral pro, sparked off STN on 80% of my SPS. Just to be safe however, I brought in some help and we dipped a large tri-color looking for AEFW. That test was negative so the clubs best guess was alk swings. So last week I hooked up a pair of BRS 1.1 ml pumps to my reef keeper and started dosing every 4 hours for both calc & alk. I staggered the doses 2 hours apart so every 2 hours something is squirting into the fuge. I'm double checking parameters with daily water tests this first week. So the good news is I'm finally auto dosing, bad news is once STN has started, it's likely to continue until the coral is gone. I'm going to frag what I can off the corals this weekend, but most have only the tips left and they are trying their hardest to hangon.
I guess the only silver lining here is the fact that most of those corals we very easy to come by in the local club here and we're considered easy or beginner corals so this will give up some room for some of the nicer frags that are out there. Right now the plan is to pick up a frag or two of something in a few weeks when the dosing has really stabilized and see how it does. I'm still working on the sump of the new tank upgrade while I try to decide between a 60 or 93 cube. The fact that I knew I was about to swap tanks anyway and Jack things up in the tank has lessened the blow of this little debacle. I was already prepared to have corals stress during the move and possibly lose one or two.
I'll do a new FTS this week, there's still plenty of color and stuff in the tank, all the softies, zoas, Monti caps, and digi are doing great.
Cheers!