I'm cross-posting this from the
Vitamin "c" dosing Calling the experts... thread
Well, I've been at the therapeutic dose (30 ppm) for two weeks now. I'm not sure if things were too far gone, but my frogspawns are down to little or no visible live tissue, same with the open brain; my montipora has bleached almost completely except for a few remaining pencil-dots of color (which with my luck right now are probably red bugs vice polyps). And now my bubble coral, which had been unaffected, looks like it's dying as well.

Here are before and after pics of the bubble:
18 Jan 09 -
last night (28 Feb) -
On top of all this my gorgonians seem unhappy and my anemone is looking really bad (shrunken, shriveled, foot not attached to anything) the last couple of days. I double-checked my params last night and there's no problem there I can see:
pH = 8.2
alk = 4.5 meq (12.6 dKH)
NO3 = PO4 = 0
calcium = 435
magnesium = 1450
I'm really getting discouraged. The only corals I have left that aren't dead or dying are my duncan and a blastomusa (I'm not counting my zoas, which I guess are fine). It's possible my favites is starting to come back, but what looks like some tissue return may just be the gelatinous clear bacterial slime that has accompanied my heavy VC dosing.
I wonder if what's left of several of these corals isn't just serving to keep a reservoir of the brown jelly pathogen in the water and spreading. If that's the case, perhaps it's best to just pull them out and boil them (the calcium skeleton could still be pretty). What's the best way to euthanize a coral - freezing?
I'm getting water ready for a larger (about 25%) water change, although I've been doing 5% about every third day for a couple of weeks now. I think I'm going to cut back the VC to about 10-15 ppm to see if the slime clears, since the 30 ppm was apparently unable (or too late) to save anything. Beyond that I'm more than open to suggestion and approaching desperate. HELP!