well, the hermits will eat left over food bits that the clown doesn't eat. The hermits don't really seem to do all that much for cleaning. They aren't big on eating algae (some types anyways). So in that respect the snails are more important.
You can always add more if needed however that sounds like a good start to me.
I bet people didn't like your "Yo" to start with. Maybe that explains the 19 views and 0 replies, meh I don't know.
Cheers.