White Spots

I woke up this morning and found tiny white dots on the glass of my 55tank. Just wondering what they could be. They come right off. All the readings for the tank are in good order. We just had our sleeper goby die on Sat. . He was really emaciated and finally stopped eating. We tried to get some medicine in him but he just gave up. Wondering if there is any relation? The clownfish and wrasse seem totally healthy, eating and swimming. Only snails hermits and a cleaner shrimp in the tank w/ live rock and a few corals.
Thanks.

 

do these white dots move?

 

I don't think so, but I'll check close when I get off work.

 

I would look here. Live Rock Hitch Hikers

And here: Hitch Hiking Copepods, Isopods and Amphipods

 

Thanks everyone. I think its some algae.