October 14, 2021 Byron Mathis gallon gravel many pounds October 14, 2021 14+ Source About How Many Pounds Of Gravel For A 20 Gallon Tank [Updated] 17+ articles for how many pounds of gravel for a 20 gallon tank If you want 1 inch of substrate. For example if you put 10 pounds of gravel in a 10-gallon t…