I would just ignore them and make sure not to overflow the pot too much lest they run away. I don't think there is anyway to get them not to float anymore except by breaking them open.
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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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