Will koi eat underwater hermit crabs?

Koi fish typically do not eat underwater hermit crabs, as their diets mainly consist of plant matter, insects, and small fish. However, if the hermit crabs are small enough and the koi are particularly hungry, there's a possibility they may nibble on them. It's essential to provide a balanced diet for koi to reduce any predatory behavior. Generally, keeping koi and hermit crabs together is not advisable as they have different habitat and dietary needs.