It sounds like the albon is working. It also sounds like they have suffered a mean case of coccidia, but are beginning to turn the corner.
I cannot believe I’m discussing cat poop consistency here, but when our foster had the runs from worms we knew he was getting better when it looks like soft serve ice cream rather than pure liquid. Just FYI, even after he was better he did need another round of dewormer of a different kind because he apparently had the most stubborn worms ever. I don’t know why, but some of them seem to need multiple treatments.I'm starting to think they have distemper. I've noticed a few biting their back legs and tail. Sigh but I think the worst is over. No vomiting. Their appetite was great today they are eating more than usually following me around until I put them up. Their energy seems great. Some of their poop is still runny but not as liquidy if that makes sense.