So I am in the middle of learning a harsh lesson, although I am not entirely sure what it is yet. About a week and a half ago I had a violent battle with the GSM Clown and the next day I noticed some weakening in my corals, especially those on the frag rack. Now several larger colonies plus nearly every coral on the frag rack have lost most color and are completely retracted. I do not see any necrosis as of yet, but the overall health of the corals is not good.
I did do a water cahnge a few days agaon, and then another one last night. I also have been testing like a madman with no evidence of what could be wrong, until last night.
Test results are as follows:
10-31-08 4:30pm
Alkalinity: 8.0 dKh (Salifert)
Salinity: 1.025 (refractometer)
Ca: 430 ppm (Salifert)
Mg: 1500 ppm (Salifert)
Nitrite: 0 ppm (Seachem)
Nitrate: 0 ppm (Seachem)
Cu: 0 ppm (Red Sea)
PO4: 0 ppm (Merk)
Ammonia: .25 ppm (API)
So I had not done an ammonia test until last night because I never do them and shouldn't have any reason to. Realizing that this is not the most accurate test on the market, I did a "control" using my fresh made SW which clearly gave a result of 0 ppm.
So the question is, where is the ammonia coming from? When I had the GSM battle, I ended up stirring up a lot of detritus and clouding the tank. That seems to be the key here, but maybe it was the heavy feeding I did for Big Blue? I find that hard to believe because the corals reacted before I put Blue into the tank, and I would think other parameters would spike as well if that was the root cause.
But what could I have uncovered in the detritus cloud? Maybe sulfates?
So I am just putting this out to get ideas. I will be swapping out carbon today and that should help. And not ALL corals are affected.