I had a slow burn is the best way I can describe it. Corals just weren't "happy". Less and less polyp extension over many months. Parameters were and are stable, typically 8-8.5 alk, calcium 400, mag 1200, NO3 around 5-10, PO4 around .08. I tested triton and my water came back I believe all green except low iodine and low phosphate. I have historically completed 10+% weekly water changes weekly. I run a calcium reactor, gfo, gac, refugium with Chaeto, protein skimmer, and I do not carbon dose.
In my eyes, the decline was over a year and I did not definitely determine a cause (well maybe). I took the opportunity to cull some colonies and lost others. Gave it until this last May to turn it around. I replaced every pump from return, ato, reactors, to power heads. My best guess is chloramines. I added an additional chloramine filter although I believe I have a top of the line spectrapure UHE unit and the filters were changed regularly. There may have also been an issue with the calcium reactor media so I switched to the Two Little Fish aragonite brand. I continued with maintenance regularly and felt like I saw a turn around So I started restocking May/June. I think my coral are growing but I'm not sure they are thriving as much as I would like to see. Surprisingly my nitrates have been drifting down although I have a large amount of fish and feed atleast twice daily what I believe is heavy. I am surprised by the low nitrates recently and have just started dosing KNO3 today. I don't have any good answer as to my current low nitrates. I have one 1"x8"x8" Japanese ceramic block in my sump for months but just can't believe it could be adding enough nitrifying bacteria to my already massive live rock.
I have a new and great respect for well established sps tanks with a long history. I mistakenly thought of myself as an experienced reefer and have been humbled through my journey. But it's ok being a novice, a little humility goes a long way. I do a lot of testing and a lot of observation of my tank. The new goal is to combine the two, careful observation of "happy coral" with meticulous testing. I don't really want to be a numbers guy but I am more committed than just keeping an eye on things. Just like all aspects of life, trying to find a happy balance
I'm hoping to log the growth of many of my frags. Taking coral pictures has become a fun activity