my levels are all 0 (am too).

The male (smaller one) hovers around one of the vents in a corner. The larger one almost sits on top of one particular spot on a rock. The smaller one ate today, but the larger on hasn't really touched her food.

She has had a long string hanging from her rear end. It was about two inches, now it's about one. Constipated? I thought maybe she was putting down eggs, but I don't see any. She doesn't appear hungry. She seems full.

I stored them in my dad's fuge during the work on my tank. It has been a full week since that issue.