I don't know what happened really. But I pulled everyone out and put them in a hospital tank until I could get the tank rebuilt. So far everything is ok. I'm still pulling out some dwarf cerths out of the hospital tank, but everything else is doing ok. Though I did lose my hammer and torch to brown jelly. I'm just going to let the new build coast for awhile. My zoas are coming around, I was really afraid that I was going to lose them too, but they are starting to open back up.