You will have complete control when it comes the areas of the aquariums you are cleaning, Perfect for cleaning the most stubborn algae like green spot algae without scratching your glass. Please be careful during installation, use and cleaning. The blade is sharp to avoid scratches! Wide handle is better for gripping, with small round hole at the end, you can hang it up when you are done using it, and the head of the knife comes with a protective cover for easy storage. Notes: 1. Rinse and air dry or wipe off with towels after using to avoid rust or corrosion. 2. The blade is sharp, please keep away from children and pets. 3. Please do not use this tool with strong acid and alkali environmental.