I am not 100% about the tang but he was perfectly fine before I pitched a ***** and moved the green star from the sump into the 29 gallon (with the tang). As for the clam, we saw him eating it. I think he bothered it to the point where it couldn't feed (by poking it) and then just ate it. He is a jerk and he's looking for a new home - anyone want him? LOL!
The tang was about 2", the clam was big, about 4", and the star, his center is about an inch in diameter. He is evil.