tiny little worms.. EVERYWHERE!!!

I just realized that what I first thought was dust or algea are really
tiny little worms. these things are everywhere.. all over the glass of
my 29G.
they look like miniature grains of rice or tiny maggots.. nasty.
what can I do to get rid of these? because of a calcium overdose most
of my fish died, I only have a yellow tail damsel lef, of all things..
(why couldn't the frozen brine eating mandarin have survived
instead!!!!) even my cleaner shrimp died...
the snails don't seem to enjoy the little worms.
any advice would be greatly appreciated..