hi im a little new to guppy breeding,i was looking at my fry and i noticed that i have a critter i didnt put in there.it very little and is on the side of the tank.it resembles a baby snail i do have anarcharis in with the fry and a sponge filter,does anyone know what this critter could be? its too small to take a pic of it anyone knows please give me a shout. thanks