If this is going to be a reef and not a fowlr, once you start your ugly stage I would start with 20-30 nassarius snails. 10 turbos, 30 astrea snails ( depends how big you get em). If you can find trochus snails, add 15 or so of them, they will breed in the tank anyway. This is a good start for when you start to see diatoms grow, After this you will need to increase as the bioload in the tank increases.
Reefcleaners has great CUC packages and is highly regarded here on R2R.