I just discovered 11 small white polyps/sacs on the back wall of my tank. They were not there last night. They are in a small, 1/2 inch group, and appear to be eggs of some sort. The only things that could have been there are my Turbo snails, Nassarius snails, or brittle stars, possibly a peppermint shrimp. Could any of these critters have laid eggs? Sorry there is no photo, I could not get my camera to focus so small.