Hello,
Wow that is some tank break down. Please let us know how things are now. But I'll be doing what Beverly recommended on the strict water change with RO/DI water aerated and corrected to room temperature.
Carbon is good but relying on carbon when there is serious trouble is not good. Also eyeballing test kit color is definitely a no no.
I am curious also at what type of skimmer are you using. Aeration is very important and a power skimmer can do a heck of a lot, usually better than running airstones.
Titus
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