I don't think it's too much if you have a full reef....depends on how much live rock you have. I personally prefer to have more snails than hermits because the hermits like to kill the snails for their shells.
I'd get atleast 20-30 snails and about 10-20 hermits. All a matter of preference and like I said it depends on how much live rock you have. You could always throw some in the sump too. (make sure passages are screened to prevent any unwanted critters clogging up your return pump.






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