If i were you i would get 15-20 nassarius snails, 3-5 emerald crabs, 10-15 astrea snails, 2-3 turbo snails, and 1 or 2 cleaner shrimp if u want, also if you would like crabs you could add some but a lot of people dont like them here since your snail population decreases a lot of times. If you get hermits make sure to buy the extra shells they have on here just to help.
Maybe a peppermint shrimp too.