We hypothesize that the difficulties of long-term culturing of B. calyciflorus populations stems from the fact that food sources typically consist of just one single algal food source and we suspect that the biochemical content (e.g. sterols, amino acids, fatty acids, vitamins) of such food is too incomplete to ensure robust rotifer population growth. For this reason, we have selected a number of promising algal species that, when combined with each other, may provide a better food source. The idea is to test which algal combination is best in sustaining rotifer growth.