Help! Fishless cycle-Now worms appeared!

[animaluvr]

Hi there,

I have been doing a fishless cycle for the past few weeks... I am at the point where my ammonia goes to 0 and my Nitrites are spiking and Nitrates have appeared. But I also have these white worms that have appeared and are on the back of my fish tank. They are very small with a slightly larger head, almost like sperm. I read on line this is a sign of over feeding or a dirty tank but I have no fish!!! The tank has only been running for just over 3 weeks. How can it be dirty? Most importantly, how do I get rid of them before I put fish in! I have only put in gravel, new decorations, lava rock, stones, one real plant and two pieces of wood I bought at the store. I guess they came on the plant?