This study includes data about Stenostomum leucops aquariorum obtained during one month after researching a 45l common aquarium with Pterophyllum scalare black spawn, in which were decorative fishes of different species. Microorganism research was car-ried out by the optical microscopy method at the Faculty of Veterinary Medicine of the Technical University of Moldova. For the microscopic study, pieces of plants were collected from the aqua-rium and the individuals themselves were collected in glass containers, detecting several species of microorganisms. Also, in this work, it will be mentioned about morphological aspects, some particularities, their resistance to different environmental conditions, drug control through the use of a single preparation, its action and effectiveness in the fight against invasion by Stenosto-mum leucops aquariorum and obviously the results which was obtained.