I've noticed a couple times this week that when my ambilobe does his business that attached to the urate is this weird sac. It's hard to see the urate as its underneath the sac but it is white.
When flipped over the Urate looking part is white which confused me. He is on a few different medicines for a ri and he is given roughly 10-15ml of water a day in order to not dehydrate from the baytril
You know, medications can really affect "output"...I think your best bet would be to consult with your vet. Maybe you could e-mail him the pictures? My vet encourages that.