I might have spoken too soon.
Just before his bed time today I looked up at Ri, as he was perching on top of his cage, and I saw a long stringy bit of poop hanging from his vent (like when fish swim around with it behind them). It was very dry and darkish green and came off all in one go, when I wiped it. Thinking about it, I'm sure he's done less poops today than usual.
He's never had this before, so now am worried because of what the vet said about his digestive system being squashed, or there being a blockage.
He's had enough water and fruit today, so I have no idea why it was so dry and just hanging there. Wondering if the meds are making him a little constipated. Or maybe it could be he doesn't have the strength to push. Or it could be down to the digestive system being pinched.
Oh, the worry. Shall ring the vet in the morning and see what he says.