A friend was looking at my aquarium today and he saw a tiny snail about 1/4 the size of an aquarium gravel stone. As you all know, I dunno much about aquariums and fish, but how did this get in there? I'm guessing from a plant that I bought that had been in a tank with several adult snails—unless snails are A-sexual. I don't mind having about 7 snails, but if it becomes dozens, then that's a problem. I could gather them and sell them. Some people like them, some don't. I'm one who does.