Clean your aquarium rocks to keep your fish healthy. You need several buckets, a hose, tap water, a cup, a net, a sponge or a scrub brush, and paper towels.
Fill a bucket for the fish
Fill a bucket half full with dirty tank water. Add clean water from the tap until the bucket is full.
Put the fish in the bucket
Catch all of your fish with a net one-by-one. Place the fish in the bucket that is full of tank water and clean water.
Unplug all equipment
Unplug the aquarium's filters, heaters and other electrical equipment.
Drain the tank
Drain the tank of water as completely as possible.
Set aside dirty gravel
Remove two cupfuls of dirty gravel and set them aside. Only having clean gravel in the tank upsets the water balance in the aquarium. This is harmful to your fish.
Take out the rest of the gravel and rocks
Remove the rest of the gravel from the tank. Place the gravel in buckets, filling them halfway. Place any decorative rocks in a separate bucket.
Rinse the gravel and rocks
Place a hose in one of the buckets containing gravel. Turn the hose on. Stir and rinse the gravel or rocks until the water runs clear. Rinse any other buckets of gravel the same way.
Clean the aquarium
Clean the inside of the aquarium using clean water and a scrub brush or sponge. Wipe the inside of the glass dry with paper towels. Rinse and wipe off filters, heaters and other electrical equipment.
Replace the gravel
Put the gravel back into the bottom of the aquarium. Mix the clean and dirty gravel well.
Refill the tank
Fill the tank with clean tap water. Add de-chlorinator when the tank is full.
Return electrical equipment to the tank
Put filters, heaters and other electrical equipment back in place. Plug your equipment back in to your power source.
Put the fish in the tank
Catch the fish in your bucket with a net one at a time, and return each fish to the aquarium.