These are fast moving ciliates. Available alone (e.g. Cat 13-1544) or in sets with other protozoans from Carolina Biological. I would recommend placing a drop on a slide, use black paper below the slide, and side illumination (see How to Use QX5) with a LED flash light. 60X mag is sufficient. Carolina also sells Protosol (Cat. 88-5141), which slows down these fast moving beasts.