[header] How to add fish to new tank [title] Wash the gravel, rocks, and ornaments. [step] Once you get your new tank and your tank additions, you will need to wash them in warm water. Do not use any soap or detergents to wash the gravel, rocks, or ornaments, just warm water. 
This will ensure these items are free of dirt, bacteria, and toxins. [substeps] You can wash the gravel by placing it in a colander.