Im not sure "what type" it is but I have had a hitchhiker clam since Sept of last fall in my tank... Finally stuff is coming off to where you can see the coloring, its sids have pretty black/brown patterns on it. However it has had some algae growing around its "mouth" and well... Bob my lawnmower blenny (super good cleaner!) decided to clean the clam. I found him dead, headless this evening laying next to the clam. Bob was so friendly, he would come to the glass and stare at me for min at a time, so when I didn't see him swiming this evening I knew something was wrong.
I have kept a close eye, and played with my
SW guys a lot lately since I got the red bristle star that likes to be hand fed.. Its so cool! The new found joy of starfish!