Hi Guys

I'm new to fish lore and to the salt water hobby I've had my tank running for about 3 weeks now it has cycled. I have a 24 gallon
nano cube with 3 turbo snails and a scarlet skunk cleaner shrimp had him for about two days but its not eating the soft pellet fish food I have what should I fed him and are shrimps hard to care for can I expect him to live a awhile with good water conditions? The snails seem to be doing great they went right to work eating algae off my
live rock. I also have to clowns that seem to stay in the corner a lot what can I do to insure there going to make it to?