Hermits are fun to watch, no doubt about that. I keep a mix but when the hermits do damage and get caught in the act, they go to The Tank Of Shame in the laundry room. That's a tank that was supposed to be for emergencies but has turned out to be a catch-all. There are snails that got too big, a rescue cowrie and a comb jelly. Today I added a crab hitchhiker that arrived. A little fuzzy looking guy, so tiny and harmless looking but why take a chance. Eventually all the hermits will transferred I suppose, and I'll be snails only.