# 2 The Half Dirt half no Dirt 75 gallon tank_ Bottom layer

fishtanktv.com-This is how I leveled up the tank so when I put on the black "designer" gravel it wouldn't be slopped to one side.... I used a big 25lb bag of large grain gravel from home depot on the right side. (it is super cheap and great for outdoor ponds, but not a good planted substrate, but on the bottom it might have a plenum type affect. but it has Zero Ionizing (iron holding) properties like dirt and clay do.