I have never been able to get a consistent answer about CUCs. In my 45 I have about 12-15 snails. I don't know the names but I have a handful of little smooth looking baby ones, Two really biiiigggg bummpy looking ones and a bunch of those little pyramid coney ones. They are all happy and cruize around and eat like crazy but then again, I do have a lot of glass surface, it being a high tank and all... Then I have two small female emeralds and one HUGE male. Then I have 2 peppermint shrimp, and one flame shrimp. And then maybe 10 very very tiny hermits. Some would say that is a big crew for my tank, but I purposely over feed for the shrimps to have things to eat and I sinking pellets that they love. So that is that.... All of my guys are happy and all accounted for too. Some people on here have like 50 hermits crabs in a 50 gal, which is not much bigger than mine! I guess it depends on how clean you like your tank.
As far as the pellets go, My clowns actually really like the pellets, They are formula 1 I think. The meaty ones... but they like it. They also try to eat phytoplankton that I skirt around the corals every few weeks. They're piggies.... Well, actually they're fish. But you know.
Personnaly I wouldn't bother with flakes. I don't think anyone in saltwater really feeds them. I have left over flakes that I have been using to ghost feed my nano. My fish would never get that. I feed a variety. I bought a pack of the frozen cubed food and it's a variety pack. It had emerald entree, a mysis pack, an omega brine pack and a squid pack (they don't like that. I am saving that for my lion, if hell eat it.) But I will open two little cubes a week from the tray and pick a little from each at different feedings to keep interest. They seem to be happy and the food is cheaper that way.
PPHHHEEEWWWWW! A lot of writing!