So, let's start from top to bottom of what John has listed.
Dwarf Ceriths - tiny little snails that he'll definitely ship 2x the amount listed at. Great for getting in the nooks and cranny since they're quite small (think on the order of grains of rice, short grain). Will be hidden most of the time, until the lights goes out and they're out feeding.
Nassarius vibex - will be hidden under the sand, until any sort of food hits the water column. Amazing sense of smell and overall great clean up for leftover food or for any sort of meaty food (think fish bodies).
Florida Cerith - Larger than the dwarfs and you will usually see these around since they're usually on the glass eating away at the brown film algae.
Nerite snail - Decent algae eaters, but you have to keep your tank on the cooler side. I would keep it lower than 76° versus the 78° that Felicia mentioned in the OP. You will find them outside the tank otherwise.
Assorted hermits - Not really a good idea if you keep any sort of snails since they will most likely go after them for their shells.
If you have the mentioned algae and want something to go after that, go to any LFS and grab a couple of Mexican turbos, 5-10 banded/tiger Trochus, and maybe a handful of red-legged hermit crabs (the only hermit crabs that I would deem safe in a reef tank with snails). After that, wait it out and let the clean up crew do their thing. You might be tempted to overwhelm the tank with cuc, but you'll end up with them dying afterwards of starvation as the population falls in line with the available food source.