Centropyge pygmy angels can pick at them or maybe some butterflies if your tank is suitable for them.
Otherwise I think your options are manual removal (mash and smash'em) or maybe put epoxy over top of them (which you can pry off later)..
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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