Description : We change 1/3 of the water in our fishes tank every week. How are we supposed to clean out the gravel?
Last Answer : Place the fish carefully in another container with half of the old water and the other half fresh water. Unplug any electrical equipment. Drain the tank. Separate 2 cups of dirty gravel and put aside. Place ... tank mixing the 2 cups of reserved gravel with the clean so as not to shock the fish.