Silverfish are tiny, they also move like a fish tail... they look like they move forward but by moving their body from side to side. They can be 0.5in-1.0in long (this includes the antenna).
When you described it, my first thought was a pest called silverfish. These can be found in damp areas like basements, bath tubs, etc. They need moisture to survive and they live in damp wood but eat mainly proteins.