Well you don't really want to add all your clean up crew at once you should take it slow. for a 100g 8 turbo's sound about right. about 20-30 nassarius 15 astrea and 10 trouchus Maybe a few fighting conch should do the trick. If you ask 10 different people you will most likely get 10 different answers to this question. There are a lot of people thay go crabless. The hermits sometimes will steal the shells from the snails.
How long has your tank been cycled for Is it cycled??? are you using RO
typically helps more with algae than just finding critters to eat it.