From what I have seen, Maximas don't recover very well from damage, at least compared to corals. I got a cool blue-green-gold maxima with a small crack in the shell (50% discount!) at the LFS and they threw in another banged up one for free. Within a day in my tank, both opened and I could see that most of the mantle was torn along one edge in the worse of the two. The area where the byssal threads come out was cracked and some tissue was hanging out. Looked to me like someone used a crowbar to pry it loose. Well, it lasted three days and then it croaked. I found the clean and empty shell the following morning (nassarius, peppermints and hermits). I am fairly confident that the scavengers left it alone till it was dead but you never know. The other clam has just started to heal the break though it could just be the coralline algae filling it in. It has been four months since I got it.....seems they heal slow if at all.