Preamble, skip if you like:
They fly back and forth merrily, chirp happily when I am in the room and when not, seems like the same song, not a fear call, and they are much calmer now about my hands in the cage, not panicking, just curious. They're an absolute delight to watch in their bath.
They've enthusiastically built a nest in one those rattan conical shapes using a variety of bits I put in the cage.
I change/add to everything in the cage every day very often twice a day, including some type of veggie (not avocado). I clean out the bottom and scrub down the horizontal "wires" at least once a week, though generally more than once, just because I'm checking. ( And sitting there, sitting there, delighting.)
But lately they have been pecking at themselves quite vigorously, under their wings or chins (sorry). And at least one of them, hard to tell who, has white runny poop. The male (I think it's the male) poops in the bath, for sure! So the bath gets changed sometimes 3 x's a day.
If they were molting there would be feathers, right? I think I've found 9 (I uhm kept a couple... don't tell...isn't this like keeping one's first child's baby teeth?)
Everything I've read about mites talks about lethargy, puffing up, irregular behaviour. As far as I can tell they are otherwise normal, except for the self pecking. They eat and drink as they have done, attack the millet

On white paper, the poops is long thin lines, of course circled by moisture. Occasional larger plop.
It seems like they have spent more time than usual in the nest, but they've only just finished it, and thought that this may indicate they/she was laying. But no eggs.
As I type they're making the slight chirpy sounds, sounds I'd equate to table conversation...
But they are also pecking at themselves A Lot.
Perhaps I am not observant enough. What do you think is happening?