I made 20 gallons of new water and added a much weaker pump last night. He was still technically alive this morning, but barely. I actually thought he was dead until I pulled him from the water and saw his gills were still moving slightly. I finished it with clove oil.
It could have been anything - sensitive to Prazi, damage from collection, it might have had a ton of gill flukes I never saw and the Prazi treatment knocked them off too quickly and it lost the ability to regulate some critical parameter...
It was a skinny fish, but I dunno, you start to get a sense of how a fish is doing after a while, and this one was showing all the "right" signs until Prazi. However, it will never be conclusive given these fish's reputation.
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