Depending on the crew you acquire you can feed just flake food to them. I have nassarius snails, they do not eat algae but burrow and sift the sand instead eating leftover food and other stuff in the tank. Hermits I can take or leave, I will probably not add anymore to most of my tanks as they like to kill each other for their shells, even if you provide extra empty ones. Just tired of seeing dead hermits I guess.
But if you enjoy hermits then they are a great idea, they are very cool other than the shell stealing thing. Another thing that you might want to add would be emerald crabs, maybe 2 of them and some shrimp.
I've stayed away mostly from turbo snails because they have a tendency to knock things over in the tank but they have BIG algae appetites.
What kind of fish and/or corals are you thinking about?
Oh and also forgot, I have chaeto and caulpera macro in my sump and it seems to be helping a great deal with my nitrates.