I have noticed a huge population of these little clear creatures first withnen my live rock, but this morning as I was doing a top off in my sump, I turned on my flashlight (didnt want to disturb the fish), and to my surprise the sponge that is rite before my return pump, is filled with these things, they seem to be in all the crevises... Now Im doing my next water change this weekend, and thats when I really Squeeze out the sponge, should I release these guys back in the tank, or let them down the drain.