you may find that some cleaners will survive, My mantis sometimes eats the snails and hermits. But when I feed him crabs (fiddler) and shrimp pieces he seems to leave them alone. Its a hit n miss issue...sometimes they eat everything and sometimes they can be somewhat selective in their snacks. In general I would reccomend some cleaners to keep things in order, but they may need to be replenished on occasion. 30 days ago I added 10 snails and 15 hermits, currently I have 7 snails and 5 hermits left. And he also has eaten 2 med fiddler crabs in the last 2 weeks...hope this helps to give you an idea ?
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