bivalve

So I removed my torch to treat an infection and found this thing hiding. I had seen it before and thought it was dead but it moves when I shine a light on it. Any ideas what it is?

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...

Just noticed that one of my Turbo Snails has a Bivalve growing on it. Does anybody know what type of Bivalve it is?

I have a lot of white specs appear on my glass. They are pure white and move very slowly if at all. I managed to get a sample under the microscope. I have a few trochus snails in the tank which have been releasing eggs lately after a water change. Can anyone help ID them from the pics attached...

Anybody able to id this bivalve?