You can either take a razor blade and shave them off as close to the rock as possible. Usually what I have done though is put them in an area with really high flow and let them blow off the rock.
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75 gallon with 20 gallon sump in the works.
R. Bacchiega. Tattooer
I didn't smack you, I simply High Fived your face.
I've got so much glue on my pants it looks like a Friday night gone horribly wrong.
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