HELP, WORM I.D.

[RICKY81]

I was looking at the tank this afternoon and i noticed something crawling on the glass, i noticed that it was a worm about 1/2 inch long, no tentacles, no legs, just plain round and long almost like the ones used for fishing.... previously about 3-4days ago i saw a bigger one about the length of maybe 2 inch. long, but when i tunrned on the lights it quickly made its way into the rocks...this tank has been cycling for the past 2 1/2 weeks 210gal.... i used some LR that had been purchased from another maastard, and the one from my previous tanks.... i checked the levels and
ph 8.0, alk. 2, ammonia 0.25, nitrite .05, nitrate 10-20, temp 78