Filed in which way?? to take the length down, while finishing the nail off or for a rebalance...?
If you take the length down or rebalance it you can file them off without a problem. i just found crushed shells to smell really bad when i needed to remove them for a rebalance
When you finish of your nail make sure that you applied a clear layer of acrylic on top so you don,t file in the embeded decoration...this really sucks when you have gold charms or so in it since those turn silver if you file too much