down the road, you will more then likely get them in your tank. I wouldnt NOT get live rock because of them. In fact i like them, but there is a downside. If you tank is very dirty and almost never cleaned, they can re produce often and eventually cause an outbreak in brisstle worms. That sucks and its very hard getting them out and keeping up on the population.
My method is once a month for 5 days ill put in the worm trap, Generally a green tube that you place some food in. They crawl in and you dump on the dirt outside and let them die, and become part of you grass lol. this will keep up on the population but at the same time wont be so tedious that eventually you dont want to do it anymore.