Although you probably already know this as a fish owner, cleaning an aquarium requires both time and patience. Your fish and plants deserve the best ecosystem possible and it is important to follow the correct steps when cleaning their sand. First of all, especially when it comes to silica sand, you should rinse it various times before putting it into the aquarium.
You can clean the sand inside the tank. You need to clean it regularly as fish food and other waste can build up at the bottom of the tank; let's say, every time you change the water of your aquarium. You will need an aquarium siphon. This item will vacuum out the filth.