Well you could remove them for a little while, while you inundate the viv with CO2 from dry ice. This will snuff out all the oxygen and then bye bye slugs. Here is a link explaining how Marty did it in his viv.
http://www.orchidboard.com/phpBB2/vi...119&highlight=
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All that is gold does not glitter,
Not all those who wander are lost;
The old that is strong does not wither,
Deep roots are not reached by the frost.
-J.R.R. Tolkien, LOTR, Fellowship of the Ring
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