TammyLiz
Fish Herder
I have had those in a tank of mine before...They just went away, though. I don't know where they came from, and I don't know what happened to them. They were pretty unsightly so good riddance! The ones I had were pretty small. White with clear shells. I don't think they were hard to get off the glass, though...they felt sort of crunchy if you touched them--their shells were pretty hard for how delicate they looked.
Tammy
Tammy