I have a 220 gallon tank stocked with one CK and one motoro stingray. I had the CK in the tank first for about a week by itself, then I added the stingray. They have been in the tank together for about three/four weeks now. A few days ago I noticed eyelash size, white worm looking things floating all around in the water. They appear to be alive and there appear to be gnat looking things floating around on top of the water, but they appear to be dead. I have never seen anything like this in a fishtank, and I have a few set up. Has anyone had any exprience with this, and what do I do to get rid of them? What can they do to the CK and the stingray? Any information would be appreciated. Thanks.