Has anyone tried to change their sand? My aquarium is 4 months old and I am in a battle with ich. The aquarium will be fallow now for some time. I don’t like my Fiji Pink sand since it blows around so easily. My wifes tank has special grade sand and it is perfect. Would it be devastating to the tank to change it at this point? Obviously if the tank were a few years old it would be for sure and I wouldn’t give it a second thought but being fallow for 76 days would give plenty of time to settle down and bacteria to take hold again.