They are very nice but the mantles don't still look like that do they? Did you check for pyramid snails? Number 3 has a few of those tube worms on it's shell, break the tubes and pull the worms out, I found one of those had gotten under the mantle of a large gigas I used to have, it may well have been the death of that clam. People say those tube worms just scavange and they may well but they can sting and kill tissue if aggravated, from what I've observed in my tanks.
If they are normally open more than in those pics, never mind except for the worms and congrats on some really clams.
I saw your thread and didn't think about clams, clownfish is what came to mind. How big are they?