The crystal ooze is an aquatic variety of the gray ooze. It is semitransparent and clear and almost impossible to see in the water. The crystal ooze can grow to a length of up to 8 feet and a thickness of about 6 inches.
It has acid that covers a crystal ooze dissolves metals and organic material, but not stone.
They can be found near a body of water, Elemental Plane of Water or even in the Underdark.