Well everyone, I have some good news. All but two corals have finally started extending polyps (most you can barely tell.) Those two remaining corals are hanging on for dear life, but I doubt they'll make it (but I've been saying that for a while.)
There's a ton of tissue damage, lots of recession. Some of the color is starting to come back (but everything is pretty much dirt-brown or bleach-white.)
We've been doing 10-15g water changes every other day since this thread was started...and even more some days. I've run carbon and phosphate removal to help remove toxics/metal buildup.
I never heard back from Red Sea, but I'm planning to email them again. I'm 99% sure it was the salt. I've had some interesting conversations with people regarding RSCP...and I think I'll bring the points up here. First, my bucket was one of those small buckets, so it's on a separate line than the big buckets...so if it was machinery related, the problem probably won't affect the big buckets. But, if there was a problem with the salt itself, it could affect everything.
On a more controversial level...RSCP salt is taken directly from the ocean. The reps advertise how this salt has every trace element corals will need. Well...what about all the stuff in the ocean that corals DON'T need? The reps claim that gold is in their salt...do corals need that? I have no clue. My point is, oceans erode land, which can bring up toxins to the corals. So, that toxic water can be pumped, dried, and sold. If it was a heavy toxic element, it would sink to the bottom of the salt pile...and whoever got the bottom batch may have a ton of bad stuff. In the ocean, yeah, the toxins will be diluted. But, take those toxins and put them into a 40g aquarium that only has its water changed 10% per week. We don't know what all is toxic to corals, but things are...and I'm wondering how RS controls that.
But anyway, sorry for my rant. Thanks to all who've offered their support, fresh saltwater, and time. If for nothing else, we can view this as a reminder that even if our chemicals all test right, things can still be majorly wrong.
On a really positive note... I've got a 150 gallon aquarium on the way!!!!!