If you are still concerned about your bristle worm, fire worm, etc there is a homemade trap you can make. See it on the
garf website.
It is real simple to make. I plan on making one today or tomorrow. I bought a 20 gallon setup from someone on craigslist and it came with its share of problems. The first was a huge worm infestation. I removed 50 by hand (chopsticks) last night and there are way more than that in there.
I just tried to get the big ones (2+ inches). Some were flatter and blue, some were red and orange. I tend to leave some of the smaller ones, but the big ones have to go.