Thanks for the advice, you guys!
KatnpCrzy, I think you're right- bladder sludge is something that doesn't often just disappear and needs to be kept under control with diet and fluids. My vet says that it can usually be managed pretty well, which was a relief since BunBun seemed SO sick during his bout of it.
Skunklionshow, I'm sorry to hear that you're dealing with the same thing- it's so frustrating and quite a worry. I am obsessed with watching Bunbun in the litter box and rooting around in the litter to be sure he peed. It's pretty embarassing for my teenagers when they have friends over- lol.
Bunbun isn't a good water drinker at all- the salt lick is the only thing that seems to get him to drink, but sodium certainly does cayse water retention. Seems every solution has a problem. I had to stop giving Bun kale too- he loved it

. I also stopped feeding him pellets, dandelion and collard greens and spinach. He was furious at first but has adjusted. I still give him his parsley though- it's not as calcium rich as the other greens I mentioned. And of course he gets other greens- I just had to find some other stufff that he likes. Swiss chard, watercress, endive and cilantro are a big hit with my bunnies these days. Lmao- my husband can't telll greens apart either! I've even tried drawing pictures with descriptions, but no deal- it's hopekess.
I know what you mean about being extra cautious with your bunnies- I'm the same way. They get so sick in such a short time- it's scary. Good idea about getting DJ to cooperate- he always panics whe I threaten to do anythimng myself. That's how I get him to do home improvement projects- I just get out some tools or whatever and pretend I'm starting the job- he immediately takes over- lol. Not sure whether it's his manly pride or fear that I'll bring the whole house crashing down. Yup, manipulation and lots of nagging works well with husbands- nicely asking only goes so far :p .
Well, hopefully BunBun will just get over this with no intervention on my part. He also has some poopy butt and I've noticed that he sometimes postures when he has that too. It must be uncomfortable, but he won't have any part of getting his butt cleaned off. Anyway, I'm gonna just watch him until tomorrow and see how it goes. I'll keep you posted!