To pick up where I left off (re. sludge):
I ended up taking nine days to reintroduce pellets into Tom’s diet. Now he’s at a steady 2 Tbsp pellets and 60g salad daily. We delay on his pellets until he’s made a good dent in his veg, to maximize water intake (we serve them sopping). I keep an eye on his urine and when there’s not much or when I see sludge, I spike his water with juice.
Yep, you read right: there’s been more sludge.
Never as much as the day I first noticed it. Only a couple of drops at a time, usually (as in figure 1 below, where the sludge is dried); at most (as in figure 2, where the sludge is wet), it’s still not a heck of a lot. And it’s not every day, not even close. And he’s continued to pee normally (when I said “when there’s not much [urine]” above, I meant comparatively speaking; there’s never been so little as to suggest a problem). And he’s otherwise perfectly normal and healthy.
I haven’t made any progress on the calcium/oxalate/veg issue. As I understand it, I should be less concerned about calcium-high veg than oxalate-high veg. But data about oxalate content in veggies is not easy to hammer down…
To summarize: life continues.