While we're talking about gravel, Cal Aqua Labs is going to offer a couple of interesting new substrates for planted tanks. Black Earth 9 in regular and fine grain and Green base XR which is a reddish brown. I set my 29g up one year ago with Floramax in a brick red color and soon wished I had went with black due to my choice of going with more red plants. Now I'm debating whether it's worth the trouble of changing. As you can see by my avatar, it's heavily planted. If you want to look at these new products, go to calaqualabs.com, I contacted them and they said they're setting up the production in Japan and will be offering it in a few months. OS.