What is the best way to change substrate in a saltwater aquarium?

I have a 55gal saltwater aquarium that has been running with fish in it for about a month now. I currently have gravel substrate and would like to replace it with sand. What would be the easiest way to do that without hurting the fish?

you should empty the tank

One Response to What is the best way to change substrate in a saltwater aquarium?

  1. Rangbeano says:

    you should empty the tank
    References :

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