This might be too late :sad1 but, I was told that they will grow other legs when they lose them and that each of the legs that were taken off, will grow another starfish. If you are able to salvage the other legs, put them in your tank and see if anything happens. Like I said, it might be too late for them or maybe they got chopped up but I just wanted to pass along the info that I had been told.
Good luck. Those are soo cool looking, it's too bad.
Cindy