I went to feed my 5 RES' tonight, only to discover the remnants of one of the smaller ones floating in the tank... basically just legs attatched to a vertebrae.
I was shocked. None of them have ever shown any agressiveness to any others. I'm rather distressed and worried about the well-being of my turtles. I don't know if there's one perpetrator or if it was sort of like a turtle gangbang.
I could at least understand if they have fought before, but they haven't. I also understand that aggressiveness is common when it comes to mating/territory/feeding reasons. But to the point of eating half of one of their tankmates? I've had them for about 6 months and know that I am feeding them enough. What's going on?