Good question. I believe it was actually a gray sponge. I'm not completely sure though. At any rate, it is now almost completely gone, just a thin coating on the rock it was on.
I just walked over to my tank to find 15 crabs on yet another snail. That makes about 5 in a week. I don't think this is normal die-off. I watched them pull the dead snail out of it's shell and noticed that the snail was a brilliant turquoise blue. It actually looked like the opera-singing alien on the Fifth Element. I don't know if this is the normal colour for a turbo snail or if it had some kind of illness?
The snails should have a good food supply-I keep three sides of the tank nice and clean and let the back pane grow a little algae to feed anyone who wants it.
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