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[Jimm]

Here is what Knop Says:

1. Manually remove the snails at night. That is the time that the snails are most active. Search the shells mantle area, the rest of the shell, and the substrate.
2. Use predation like a small wrasse. Coris gaimard seems to be perfectly suited for this purpose.
3. Interrupt the reproductive cycle of the snails with the help of a powerful skimmer in connection with UV disinfection.

From Giant Clams: A Comprehensive Guide to the Identification and Care of Tridacnid Clams.