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No, inverts don't effect your bioload very much. Pistol shrimp and peppermint shrimp are great. I'd say one pistol and maybe a group of 3-5 peppermint shrimp would be good for cleaning up excess food.
Yes because they are preforming different function. The snails are gonna clean algae. The shrimp will clean up left over food. The hermits will do a bit of both.