Nutrafin Betta Enviro-Clean Bowl Biological Cleaner Nutrafin Online Price $4.79Regular Price $7.87 Default - $4.79 Quantity This product is currently sold out. Nutrafin Betta Enviro-Clean 60 mL (2 fl oz), is a betta bowl cleaner that biologically breaks down waste in betta bowls and containers while promoting clean conditions that help reduce diseases.