Many long-term studies on larger vertebrates provide us with only a single time series to study population dynamics. To test all the interesting hypotheses arising from these studies, we have to shrink those systems into tubes and replicate under different treatments. For this, with the invaluable help of Dr. Diego Fontaneto (Institute of Ecosystem Studies, Italy), we chose the rotifers as our experimental system. It didn’t take too long for us to realize that we needed expert help. And that help arrived as a swiss-army-knife of a guy: Stefan Sommers, our research associate, rotifer-meister, orchestrator of our microcosm lab!