Nautic XP algae fish tank cleaner products use nanoenergy packages to dislodge algae in an entirely safe manner, they are non-toxic and non-hazardous and food grade and offer highly effective algae cleaning. Contain no biocides, bleach, or acids, so safe that users need no PPE with this ultra-safe fish tank glass cleaner in 1 litre or 5 litre size. Dilute the product at 1 part concentrate to 10 parts water.