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Paul sand - References for that statement please
Sincerely Lasse
Tolerance of un‐ionized ammonia in live feed cultures of the calanoid copepod Acartia tonsa Dana (Research study)
That study looks at higher tolerance of copepods, but you are also correct this research is mostly dependent on copepod types/species some do better under different conditions just like different corals. If they are alive there is a 50/50 chance levels won't be dangerous enough to harm fish, but it could be a resistant species of copepod too.
Just like so much in our hobby no clear answer...