You're probably right. The dorsal and tail fins were also a little bit ragged looking compared to normal which I had noticed. Like most people I purchased the CBB for aptasia control. With any luck after 6 years that crap won't come back and I won't feel inclined to purchase another.
This 3-4 year old powder blue tang is my next typically delicate fish and it still looks relatively round so I've got my figures crossed that this was an isolated incident. As a precaution I'm going to start adding garlic extract to their food again. The CBB only cared for Mysis and whatever worms etc that grew within the tank but the tang also eats pellets and nori daily.
