found the problem with high nutrients and rising salinity. The waste water line for the auto water change was on backwards. I was feeling really dumb today. Either way the problem has been corrected. One of these days I'm going to get this tank stable one way or the other. I have a week of PTO I need to burn before July. I'm thinking about taking a week off just to work on the tank. LOL
Good catch! That might have taken much longer to find!