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meowzer, no they are much much smaller. tonynader, they look kind of like that. However, I found one on the glass and whatever is inside it looks like a coiled worm. From the outside they are have a depression or hole in the center. Originally Posted by Cranberry Their spirorbids. Harmless but...

Can someone identify this for me please. The live rock and back panel of my tank are now covered in these with donut shaped critters. They started appearing a month ago and have been growing in numbers rather quickly. This is in a 1 year old BioCube 14 - saltwater.