Hey- Hope everyone is doing well and surviving!
I've been away for a bit - we all took a very long break from personal tech due to all the WebEx and Zoom activity and we've been trying to RV on weekends as much as we can.
So the tank update: While we were away a couple of months ago, my COR 20 failed and it was during some especially cold nights. I don't know exactly when it failed, but it had to have been over 36 hours because of the timing I had last checked into Fusion.
I had circulation in the tank, but not heated water (I now have a back-up heater in the tank), so the tank's temp at the time I checked it was a chilly 61. I replaced the return with a spare and brought the temp back up.
Most of the Acros had already begun to show stress and moderate bleaching, but over the course of a week, things started looking noticeably better. Then, for reasons I cannot grasp, my pH crashed to 6.9-7.1 and I could not raise it without radically altering Alk. So, I did a series of small water changes over the next few days, but I was stuck at 7.25. I changed my Co2 media (again) and kicked the skimmer on full blast, I then went to Pet Co and bought an air pump and a stone. After those were hooked up, I eked another .05 pH out over the next hour, and so I let that run for a week, but I topped out 7.32. So, I did the only rational thing I could think of: heavy water changes, which actually worked.
The Acros didn't care though. most bleached and RTN set it. I fragged and dipped, re fragged some, but was only able to save 5 pieces. I even think my tank went through a mini-cycle given all the craziness.
Anyway, fast forward to today, I'm enjoying excellent stability for a few weeks now, and those sticks I was able to save are coloring up well. I'm going to give it a few more weeks before I think of adding something.