DB,
I left you a PM and posted a ways back on bacterial infecctions and my similar experience with rays and Discus. There is no mention or recognition of my postings or a reply to my PM. Use Metronidiazole - that's what I used and it worked. I think you have a bacterial infection form either the discus or the new rays. That is the primary infection that weakens the ray. Then they get secondary infections from things they normally can fight off. Treating for the secondary infection or giving pristine water conditions will not cure the bacterial problem. UV will not cure it if it is internal. I may be new to MFK, but I've been keeping rays since 2008.
SEE POST 62
I apologize for that. You deserve credit as I think you're on the right track. I believe you are correct about the bacterial infection. However I have already been informed that the disease that is normally cured by Metro is becoming immune to it.
I ordered meds the day after this thread started.
Someone PM'd me shortly after this thread was started and gave me some absolutely priceless advice. Let's hope it works.
There WILL be something learned from this thread, not just about rays being sick but about people helping eachother.