I wouldn't worry about CUC rn. You have a brand new tank, and don't need CUC. However, once you start experiencing algae, I would get a variety of members, snails, an urchin, and hermits.
This is also a very good write-up that can help you out!
Choosing Cleanup Crew Critters. Cleanup Crew. Tank Janitors. Tank Cleaners. Functionally, it means the same thing to every hobbyist…. inverts added to your tank to keep it nice and sparkly. It’s a necessity (Well, not an absolute necessity) Everyone has one. But, if you ask those people what...