clam question

The ones that are in my rock are about 1" by 0.5". Thank you guy I was just wondering because the tank has been operating for going on 4 months. Corals re growing good some better than others. I keep loosing hermit crabs though put them in and they are good for a few days and then they just disapear. I have moved almost all of my rock at one point trying to catch a flame angle to TQ it. I should have left it be as It died from the stress or the ick or both, I hate that. So I treated the tank after that quorter dose of a general aid that pet cetera plus Aquarium Polyaqua. the only things that seemed to clamp down were the herms and snails the rest of the criters in the tank it was biss as usual. I use this comibation when I QT new fish and it gets rid of any Ick on new fish that is visible when purchesed.

Bill