White tentacled specks
I've got some tiny white many-armed creatures on my glass. There are hundreds of them, each with a small white center and 3-8 arms or tentacles. They're attached to the glass and don't move, but scrape off very easily with the magnetic cleaner, then promptly come back after about 1/2 hour.
Anyone know what these are, and whether I should be concerned or happy with their presence?