I know SPS don't like change, esp any kind of rapid change. Earlier this year, my P04 got a little higher, from near zero (hanna digital checker) to about 0.10, and noticed some of my SPS lose color and grow slower. I also disconnected my bio pellet reactor, and my N03 crept up to 30 ppm. I am sure that didn't help either. And GHA took off with a vengeance, too.
Then this summer, I had a problem where my KH doser line plugged, and my KH fell to 5 before I figured that out (was away a lot). Once I fixed that, I upped it to about 9 (miscalculated and did it too fast). After that, I noticed real problems,... white burnt tips on some of my SPS, and big loss in color as well as some STN on some SPS.
Took me a while to get everything stabilized, and meanwhile some of the STN turned into RTN, and lost some of my prized SPS. It took about a month or more after my tank was stabilized before my SPS started to turn around.
Good news, though, is that everything now is looking much better, and growth and color is returning (although still a ways to go from what I had before). I think it just needs more time now, and have to keep everything very constant and stable, esp that KH. My GHA has pretty well disappeared too (needed consistent zero P04 and zero N03 before that let up).
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