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[joda]

i'm not a fan of rules of thumb generally, but people usually say 1 snail/hermit per gallon. but it really depends on the size of the critters. i like nerite snails. they're small and they eat continuously on the walls and rocks. i don't like hermits much so I've used way less than 1 per gallon in my DT. i like nassarius snails for the sand bed, but they come in lots of sizes, so you really have to alter that rule of thumb. no doubt, others have other opinions.