A clean up is NOT a necessity really. If you do your water changes, dont' overstock and ont overfeed you really dont need critters to "clean" up anything. If you like hermits and snails then thats great too, add a few that you like.
I dont have much cuc really, but I happen to like the narsarius snails that bury themselves in the sand and come out for feeding time. lol I have like 100 or so between my tanks just because I like them. Also keep in mind if there isnt much for them to clean up then you have to feed them as well as the fish. lol