How is the CBB doing. Try blackworms to make him fat.
FWIW I have not found prazipro to be particularly effective on (suspected) internal parasites - external flukes, yes, internal worms, no. I have used food soaked in metro to be much more effective on the internal buggers.
If he likes clams, maybe try feeding him a clam every day. I feed all my butterflies little neck clams on the half shell three times a week. They are pretty available where I am in southwestern Ohio. Freeze them, and then thaw them out. You can leave it in there for the day and pull out what he hasn't eaten in the evening.
If you decide you can't keep him, I may be interested. I'm about an hour north of Cinci and have a 240 butterfly/angel FOWLR i'm setting up.
How are the clams working out?
The CBB is dead this afternoon. Thanks everyone for your help. I will not buy another.