Soil food webs have many diverse and interacting organisms. These include organisms as small as bacteria, fungi, and nemotodes but also small arthropods like spring-tails and mites, and larger ones like earthworms, millipedes, centipedes, and spiders. We were interested in how one of these typical interactions were affected by the precense of invasive earthworms. We replicateda  simplified soil food web in the lab with soil, leaf litter, and combinations of spring-tails, centipedes, and invasive earthworms. We expected earthworms would alter the litter amount and arrangement making it easier for centipedes to prey on spring-tails. We monitored the organisms for six weeks and we were surprised by the results. Spring-tail abundance was reduced by earthworms but not centipedes. It is not clear why earthworms have this negative effect on spring-tails, but it could be due to the earthworms' effect on leaf litter or the spring-tail eggs. Earthworms did not fair well when they were combined with centipedes, while the centipedes gained weight when combined with earthworms suggesting that centipedes preyed on earthworms, not spring-tails. These results suggest that invasive earthworms may be a new food source for centipedes, and that it can be difficult to predict the trophic nature of food webs with invasive organisms.