I looked all over the internet trying to figure out what these are. So thank you in advance for any response. First noticed them after live rock had been in tank for a few months. If you look at the pic you will see what looks like a bivalve shell with spines on one side. At first I thought it was a limpet but the ones I have move around. Hoping they aren't bad.
![20220502_163954.jpg 20220502_163954.jpg](https://www.reef2reef.com/data/attachments/2586/2586136-897833aaa0bbbf5f4bb1d0353f5cea7b.jpg)
![20220502_163954.jpg 20220502_163954.jpg](https://www.reef2reef.com/data/attachments/2586/2586136-897833aaa0bbbf5f4bb1d0353f5cea7b.jpg)