Randy, good to hear things are back to normal.
I noticed when my nitrate hit zero using a Salifert Nitrate Kit, I had to back off on the amount of vinegar I was dosing by about 1/2 due to increased bacteria growth. I'm curious if this is the same for you?
I don't understand why bacterial growth would increase when nitrate hits a very low nitrate & phosphate reading? The same has been reported with vodka.