My naso did not make it through quarantine. No visible parasites, was still breathing ok, just seemed that the lights were on and no one was home last night. He would not swim, was laying upside down being pushed against the rocks by the current in the tank. I grabbed him cuz I thought he was dead, and he flopped around. Realizing he was still alive, I let go of him and the current just pushed him around some more. I turned back the ball valve to give him a chance to swim, he was having no part of it. I left for an hour or so and the fish had even less energy/reaction to touch than before. It was hard for me to do, but I euthanized him after I had no doubt he wasn't coming around. I have seen lots of fish ciseases and problems, this 1 is new to me. I am not doing hypo or copper or anything right now. There are 0 visible problems with the clown fish or wrasse that are in the same tank. The only med II have used is praziquantel, as I always do preventatively on w/c fish. Anyone have any ideas or similar experience?