White spots on glass?

[asc900]

Hi guys. I'm Akari trying to figure out what these white spots are. They are only on rocks and invertebrates shells. Thanks.

 

[cdnco2004]

Hi guys. I'm Akari trying to figure out what these white spots are. They are only on rocks and invertebrates shells. Thanks.

This looks exactly like what I am getting now. I have them all over the glass rocks and even on the shells of snails and hermies. @asc900 what did they turn out to be for you?