In a regular "staring at the tank" last night, I saw a tiny - maybe 2 mm snail crawling on the glass. Upon further investigation, many of these crawing around in the sand. I've got 4 turbo snails that have indeed recently been crawling ontop of one another I suppose this is the result. I tried taking some pictures this morning, but they show as nothing more than a dot. Not sure if anything might consume them - maybe I've had many reproductions that I didn't even realize in the several years the snails have been in there. Then again they could have come in on something else.