Are there saltwater feeder fish/shrimp existed? Just wondering because I never heard about it, except I heard guppies and mollies are often used as feeder fish for saltwater fishes.
Mollies can be converted to full sw so if you did that then they could be used as sw feeder fish. sw grass shrimp are also used as feeders and can also be bred fairly easily. Other than that, if you really want feeders you can just catch some baitfish from the ocean but you're in Minnesota so that isn't possible.