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On my rock in areas of low concentration I have 8 vermetid snails per square inch. In areas of high concentration I have 14 snails per square inch. If I put in a new peice of rock rubble it takes about 1 month to reach the 8 vermetid snails per square inch level. They attach primarily on all of my live rock and rock rubble. They do not attach as readily to the glass, though some do attach. With this many snails manual removal would be extremely difficult and time consuming.
Having said that I may try that at some point. Although I speculate if I left any of the vermetid population they would be back up in numbers within 2 months.
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