A newly introduced fish will have a compromised immune system, and if gets inundated by flukes can have a pretty rapid demise. I have seen a handful of instances that match your timing with flukes.
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Did you actually SEE any flukes come off? Maybe TJ has super x-ray vision, but I confess I don't see them in your photo LOL. IME flashers are incredibly twitchy and not at all good at settling into a community tank.
A newly introduced fish will have a compromised immune system, and if gets inundated by flukes can have a pretty rapid demise. I have seen a handful of instances that match your timing with flukes.