jeremy
Guest
Not sure what these little critters are. They are always on the glass of my 20L. I can clean them off and within an hour they return. Sorry if the pic is bad but they are small and it was hard to get a good photo.
Those are flatworms, looks like you have a pretty bad infestation. What fish are in the tank?
I thought they were flatworms also so last week I treated the tank with a flatworm treatment and they retuned this week. I have 1 maroon clown and a bi color basslet (unsure if that's the correct name).
Hahahaha!!!! Now that I look at them they do look like PAC MAN ghosts!!!