So I previously had a problem with two bristle worms/fireworm (never figured it out 100%). Ended up catching one and never finding the other (may have died). Now I went down to check on my tank and saw these two little white lines thrashing around at the top of my tank, I turn on my white light and they drop to the sand. One was pinkish/red and the other was blue. Not sure. Will try to remove another night when I see them.