#newaddition

Please don’t mind some of the damaged corals they stung each a little ago and I had to move around not final tank + some new additions some aren’t completely open as well and others are receiving treatment

Hi all Tank is swarming with copepods and this weekend I finally get to add a fish (still deciding on the first tank mate!) I saw this weird clam like shell on the live rock. Any ideas what this is? I did think it was a clam or some kind of mollusc but kind of can’t believe that! Any ideas are...