Thanks Cecil, had my reply window open for a long time so didn't see your post until after I had sent mine. Always appreciate your experience with these matters when going through them for the first time.
I felt that it was time to act and didn't want to wait for the pathology, which as you said would have taken at least a week (or more) to confirm that the infection was treatable with Romet. If some want to call it irresponsible so be it. I can't let a three year investment go down the tubes when the means to treat it is readily available for $29 and all of the affected water is within my control. Still have not identified the stress factor and I'm sure its a combination of things.
Thanks Dave, missed another post while writing. I better start reviewing this board more thoroughly.
