Hi, this is my first post, although I have been lurking for about a week now. My 20 G nano with 20lbs LR, 20lbs. live sand, seaclone skimmer, wisper trickle (w/o media) 65W/65W actinic lighting, is on Day 5. I found these guys in several clumps on my LR, and am wondering what they are. I have included a pic of them and my tank. Amy comments will be appreciated. Thanks