Tandanus tandanus is not the primary subject of the video clip; the primary subject is Hydrilla verticillata (Waterweed). Australian freshwater, Duration 37 seconds
Description: Deutsch: Das Kampfverhalten des Magnum-Prachtharnischwelses im Aquarium. English: The Magnum Orangeseam Pleco in fight. Date: 5 March 2019. Source: Own work. Author: 5snake5.