Biological Filtration is the process by which useful microbes break down dangerous substances, including ammonia and nitrites, into fewer toxic compounds. Bettas are labyrinth fish this means they are able to breathe oxygen straight from the air, together with getting in oxygen by way of their gills. ​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​... https://pearlaquatics.my/blog-post/