Have you ever tested your pH for swings? If you have a low KH, you have no buffering capability in your water and the pH will swing wildly. Fill up something with tap water, dechlorinate it, and then test the pH. Test the pH every few hours or so (5 hours even) for the next 24 hours to see if the pH changes and how much if it does. pH swings could account for clamped behavior.
So I was in the kitchen, and out of the corner of my eye I saw a mouse. I caught it in a container, and just as I was about to put it outside, it jumped somewhere. I was pretty sure it was somewhere on the floor, maybe making its way back to the cupboard .... about twenty minutes later, I suddenly feel as if I need to scratch my shoulder. But then I feel the scratches MOVE. I take off my sweater, and lo and behold, stuck to it is the mouse! I had a mouse in my sweater for twenty minutes without even knowing it! The poor little darling wasn't hurt though. I've released her outside and hopefully she'll be okay.
Aw wild mice are so tiny. Not pet material though, chocolate. noooo. Just no. They can carry parasites and strains of illness which can be passed to humans. Plus it would never tame to humans and would probably die of stress.
I hate to think it, but where there's one mouse there's a family. Hopefully you caught it on its first day but if it got inside from a hole there will be more as the weather cools.
But I would freak out if I had a wild mouse on me for that long. I like them and think they're cute but I don't want to touch them.