I wonder if you're right about the bacteria die off and new type of colonization.... that's a good theory and one I hadn't thought of.Nice to see ya Mike. I wonder what would cause the pH to stay low like that. Could the low temps have killed off some type of bacteria and then created an environment for some new bacteria to take over?
It’s nice everything is stabilizing now. Where did you put your backup heater? Would it work in the overflow or would that end up only heating the water there