Update: I did a large water change (75g) yesterday with freshly made saltwater from a nearby LFS. Afterwards, all of my parameters tested within a desirable range. At this point I've lost all of my SPS except for a forest fire monti which I still see some polyps out on, a ponape birdsnest which looks ticked off but hasn't bleached out yet. When I used a turkey baster to get sand off of my neon highlighter acro colony, the color was literally blown off of the skeleton. LPS-wise a couple of hammers are pretty much done, along with my space invader pectina which has flesh sloughing off. Three of my acans seem to be doing ok but they definitely don't look happy. As far as softies go, strangely my bubble tip and rock flower nems seem to be doing just fine, but the majority of my zoas are closed and definitely unhappy. As far as livestock goes, the fish, shrimp, and crabs seem to be doing fine however the snails seem to be stressed and we've lost 3 turbos so far. We'll see if things start to improve over the next few days. I purchased new water containers and ordered new RO/DI filters from BRS to hopefully eliminate the water being the culprit.
So now I am trying to figure out some courses of action going forward. I am waiting to receive my Triton test kit so I can send a water sample off and hopefully figure out what may have led to this crash. I'm still baffled by all of this especially since the nems and the inverts seem to be doing ok although they tend to be fairly sensitive to toxins/heavy metals.
If it is for some reason a heavy metal spike or toxins, will those things linger or leech into the rock like copper does? Additionally, I have two MarinePure blocks in the sump and I am not sure if I should remove them or not.
I know if this is the case I will likely have to start the tank over since the rock and sand would be useless.
Again, I appreciate all the input and advice I've received from everyone.