Brad, I will add it's ALWAYS good practice to obtain from a good, proven, healthy source...That's just being thorough, proper and an attempt to maximize our efforts which is good practice.
I've moved fish from body to body, likely several folks do/have. The problem can me more than something as simple as a tapeworm though.
We should all practice good form to keep the balance as "neat and clean" as possible. What mother nature does is beyond our control in most cases.

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