Clown not clowning around

[Duchess]

My normally perky false perc isn't perky anymore. Squirt, my smaller clown, has taken to hanging out in different places and moving more slowly than normal. For a couple of days he was doing a side-stroke at the top of the aquarium. He'd swim on one side and then swim on the other. Today he's parked in a typical head-down clown parking position but in a different corner of the aquarium. I haven't seen him eat in days and I think he's looking thinner.

No spots, no injuries, nothing new added to the aquarium in months. Water chemistry readings are normal as is salinity, the temp is a little on the low side but that's the way it always has been. The other fish in the tank (the other false perc, a scissortail dartfish, a yellow tang, a LMB, and a mandarin) all are fat, happy, and acting normally.

Any ideas to what could be bothering Squirt would be appreciated.

Thanks!

[dalejr_802]

it could be Brooklynellosis the same thing happened to my clown and he died last night treat it right away and put him on a qt tank

[Duchess]

How long can brook stay dormant without infecting a fish? Squirt has no lesions, no slime coating, and has been in the tank for 18 months. The last time I added a new fish was in April and that was after the fish stayed in the QT for five weeks. Anything added to my tank stays in QT for 5-6 week weeks first.