What is a major caution associated with feeding unknown, wild-caught feeder fish?

Answer

They can introduce diseases or parasites into the main aquarium

Experienced keepers strongly advise caution with random feeder fish because they carry a risk of introducing diseases or parasites.

What is a major caution associated with feeding unknown, wild-caught feeder fish?

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Arowana Fish Feeding Guide: Best Foods for Your Aquarium Predator

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