Sahin, here is your update, lol....
FAIL.....
I am in a re-boot phase. Here is what I have decided to do moving forward, on this tank.
1. No additives at this time other than occasional ca or mag supplementation
2. Dripping Kalk/ Calcium Hydroxide(30ml every hour) this has proven to keep my current corals and inhabitants dialed in around 8.5DKH, Calcium slowly declining, but I give it a shot every week or so, Kalk alone not enough to sustain both, but doing a nice job nonetheless.
3. Upped my feeding to fish twice per day
4. ATB skimming like a beast, running chaeto in center chamber of sump, lit on opposite cycle of main tank.
5. ATI Carbon active, changed every month
6. NO PO4 removers(may have been my problem, explain later)
Personal observation: I believe like so many others that have had successful SPS tanks, before all the propaganda behind number chasing/obsession, I lost my ability to see what was truly happening in the tank. I have taken a step back, rebooted, and started over essentially. I will get a current snap shot at some point to show my current rock layout. At this time I only have the following, and the list is short in SPS, lol...
1. Orange Digi
2. Montipora Setosa
3. Purple Bonsai
4. Acropora Desalwi
These are all fragish size, and have added some other non sps as well. I am taking my time, and making sure that these corals sustain a few weeks with signs of growth before any new additions. BTW I have PO4 Hannah pocket meter, and Salifert Nitrate test kit, however, I am no longer going to test for these. I am going old school, using the algae on glass to determine my nutrients. I am however testing Alk, CA on the regular to make sure and dial in. Again, Kalk dripped seems to be locking me in, my PH really appreciates it too

PH, not something we here in discussion anymore, used to be heavily discussed, I truly believe a proper PH is more important than PO4 and NO3

Thanks for checking things out!
Regards,