40 gallon

Agreed that it is better to buy individual cleaners as opposed to packages. Get snails that will perform a variety of tasks, like Astrae snails for the rock and glass and Ceriths for the substrate. Zebra and Scarlett reef hermits are both good choices as well.

Let the tank cycle for a month or 2 and add a few snails/ hermits at a time.
 
AquariaCentral.com