If you are going to add a CUC, go slow. Depending on the size of your tank, start off with only a handfull of snails & maybe one scarlet hermit crab. See how they do for awhile and then adjust the population accordingly. There's really no point in buying a ton of critters right off the bat only to watch your tank balance out the population for you. Having the least amount of janitors is really what you want to stive for IMO. GL.