My only fish recently vanished, so I have a 2.5 gallon reef tank full of copepods. But I saw a creepy looking creature crawling through the rocks. It looked sort of like a 1/4" white hairy caterpillar, with 100 legs. I've seen two miniature ones on the wall of the tank, but they don't move much. I hope the thing in the rocks was my imagination but I can't be sure. Of course I don't have a photo. Any ideas?