I just have 1 Percula clown. I have had him for about a year, his name is Meano because he used to bite me anytime I put my hand in the old tank. He seems much happier in this tank and hasn't bit me once. I would like to add another clown I am just worried about it since it has been just him for so long. I thought about adding one when I switched tanks but was worried about a mini cycle(which did end up happening)
For CUC I have about 8 small Nassarius snails, 2 Cerith snails, and a tough little turbo snail that hitchhiked and actually survived the initial cycle in my first tank. Never had any luck with Hermits but I think they are a cool little creature.