Beverly, when things die, snails, clams, ect. or rather are dieing, they release chemicals that will alert other "cleaning critters" like worms, that they are doing so. this will bring out worms carnivorous snails ect to start munching on the dieing critter. I don't feel that the size of that bristle worm is you culprit, I could be wrong but it is my gut instinct.
You mentioned that the snail was a Margareta snail... have all the dead snails Margareta's or the majority of them? from personal experience I find the life of Margareta snails are very short in our tanks with the odd exception. this is mostly because they are not a tropical water snail and our tank temps are actually to high for them so they seem to die off rather fast. The slime worm Brad was talking about and that I think I have seen a few times in my tank was stretched through a mucus tunnel on the sand over a distance of 14" and he still had the majority of his body in the rock from what I could tell.
So you might have had a baby one that is just starting to be able to get snails, or you could just have a opportunistic feeder getting a meal from a dieing snail.
Steve
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