Hi Florian, I use always different seeds. In the video I am harvesting a mix of broccoli, mustard and arugula. I l've also using mungo beans, lentils, alfalfa, radish, sunflower seeds, brown millet, red clove... and also grass. There are some seeds that get very slimy (arugula, basil, chia, mustard) when sprouting. So one way is to mix them with other non-slimy seeds, or grow them as microgreens in soil.