I noticed the other day some bug looking critters crawling around on a rock in my tank. They are so small that I don't think they will appear in a picture. They appear slightly white (almost clear) with multiple sets of legs coming from their bodies. I think they look slightly like a tiny termite. I haven't seen them crawling or eating any of my softies but I am concerned. I haven't had any additions to my tank in over 6 months so it's strange that they just came out of nowhere. Should I be concerned or have to treat my live rock to get rid of them?