Got you covered, @Burr740. They are $8.95 for a bag on Amazon.
If it only happens when you stir up the substrate, maybe it's scuds biting you? Those things will take a bite out of anything. Kinda like sea lice.
Lol I had some in the cart already picked out when the sword thing was happening. The substrate thing's no big deal plus every six months is a little different than once or twice a day
Scuds you say? Could be...