I read an interesting thread on Reefcentral about flukes being a part of the 'sudden death' of pygmy angels and their not eating.

http://www.reefcentral.com/forums/sh...5&pagenumber=1

I would do a full quarantine and just because the fish is eating you still may want to do the fluke treatment listed above (basically temperature / ph adjusted FW dips) and treat for internal parasites at the same time.