How To Clean Fish Tank Gravel. Then use a siphon or a cup to move about 50 percent of your tank water to the holding tank. Lastly, don’t forget to add fish back to the tank from the bucket.
Pour the solution into a bucket of the gravel to be cleaned and gently stir the gravel to ensure thorough cleaning. There are loads of affordable (i almost want to call them cheap) gravel vacuums available online that will make your life so much easier. Put the gravel on the bottom of the fish tank and place the plants.