I have a houseplant in a big pot. A week or so ago I put some avocado seeds in the soil just to see if they'd sprout. Today I polled a seed up to see if roots had started to grow yet and I saw a ton of little silky worm things squirming all over the seed! I can't find any information or pictures that match what I'm seeing! Has anyone dealt with this before?!

You may have pot worms. I don't think they're harmful but it does mean your soil is too wet.

I always recommend that folks use only soilless, peat-based potting mixes for their indoor potted plant. Garden soil is often contaminated with a variety of critters that are okay outside, but you don't want in your home.

You mentioned a "big pot." Oversized pots tend to retain moisture for too long and that not only creates a nice environment for critters but can also suffocate roots. Small pots are better.

that too, but also, i found the best way to get avacado seeds to sprout is to soak them until you can poke toothpicks into them then suspend them over the top of another jar of water. this will also preventing them from rotting before they can sprout in soil ! hope this helps?

Dashler said:Today I polled a seed up to see if roots had started to grow yet and I saw a ton of little silky worm things squirming all over the seed! I can't find any information or pictures that match what I'm seeing! Has anyone dealt with this before?!

They could be nematodes. I encountered them a few years in pots in which I re-used old potting mix from previous years. They are rather common in garden soil. See these photos on the Internet.
https://www.google.com/search?...

ZM