[Delphinus]

You *should* be able to see flukes but then again they are white and opaque and a CBB is white so unless they go onto the eyes it might be very difficult if not impossible to detect them in your situation.

Here's my thinking: if it's flukes, doing nothing is likely not the best course of action. If you have the ability to deliver a prazipro treatment, it might be a good idea. Now that I know more about flukes, I've heard that butterflies and angels seem to almost always come in with flukes.

On the flipside, if the fish does not have flukes, I'm not sure if it hurts the fish to do that Prazipro treatment regardless.

The downside is that it will kill off all manners of flatworms (things will come out of your rock that you had no idea you even had) and it's very hard on your biofilter. I also lost my abalone shortly after a prazi treatment to my whole tank, it's hard to say whether it was coincidence (it was 5 years old, I have no idea what their lifespan is) or whether it was related (all the other snails lived through the treatment, but an abalone is somewhat different than a regular snail, so who knows).

As far as hospital tank vs main tank, tough choice. If the fish has flukes, now they're in the main display and others will be exposed to them. But it's harsh to treat a main tank and accept the consequences and the subsequent tank reset that comes after. A hospital tank is perfect isolation but the stress of capture/moving the fish is usually worse than whatever you're trying to treat and the hospital tank itself will have to cycle and the fish can just die from ammonia poisoning. I never know what the best choice is. But when I had a fish with flukes, it was apparent within days that it was a TERRIBLE infestation and so I made the choice to treat the whole tank and accept the consequences. Other than the abalone, all corals and inverts made it through it and took a few weeks of water changes and carbon to get the tank looking "good" again .. but the important thing is all fish came out of the event healthy, which is amazing if you saw what my lieutenant tang looked like at the peak of the flukes infestation, I thought he was a goner for sure but the prazipro fixed him right up. I'll find the picture and post it later.

FWIW I'm of the opinion that I will treat prazipro any new butterfly or angel that I buy from now on, regardless of symptoms or not. Unless MAYBE they come from a known fluke-free source (ie., another tank that shows no signs).