tiny white critters on glass in 3rd week of cycle

what are these little very little white critter slidding low allover the glass?
3rd week of cycle 55g tank 76lbs lr 60+lbs ls

 

without a good macro image its hard to say with certainty , But I got an explosion of tiny snails and tube worms on my glass and plastics that occured within 1st month or 2 of tank being set up (probably on the rocks as well, but harder to see them there)

 

i dont have a pic of it right now but they seem to be all over the glass, and there fast. i thought i herd that its had something to do with the tank cycling?? or i dunno

 

I believe they are tiny non swimming jellyfish. That's what I had on my glass when I was cycling my 40 breeder, they will die off in a few days/weeks with no impact on the tank.