BIG TROUBLE!! Need advice please.

[Aquattro]

Separate frag tank, or is it connected to display? Since you're out of salt, I guess a water change isn't going to happen. At this point, make some new water, get some salt, do a water change. Add fresh carbon, but try not to change much else. Ya, adding the frags, maybe not a good idea with your parameters like that, but it's done, so try to save what you can.