Well, like we all know experience is the best teacher. I used to think that you HAD to have snails, scarlet hermits, blue leg hermits, brittle stars, emerald crabs, etc etc as your "clean up crew". Then I would wonder ... gee ... where are all my snails going? I guess I need to buy more. Gee... where did that fish go? All the rest seem to be doing fine.
Now that I'm a little more savy, my clean up crew is my vacuum siphon that I use to vacuum my SSB during water changes. I keep a sand sifting star, nesserius snails, and a tiger tail cuc. That's it. And you know what. I have zero nuscence algae.