Join Date: Feb 2009
Location: Northern California
I've heard of using potting soil as the bottom layer and then topping it with something so it doesn't float around the tank. You could maybe try this and then top it with black gravel, sand, or a small amount of one of the black planted tank substrates available. Just make sure you put your plants where you want them the first time so you don't end up with dirt floating around the tank later. Perhaps put the soil in, plant the plants where you want them, and then add the top layer...