After my last post I decided I want to start over with my plants and substrate. I just don't like the way the sand and flourish black look. The sand just sinks down and compresses to much. Here is the question thought, and it's probably a dumb one, but I have to ask. Can I use just the Flourish substrate? And if so would 30 pounds be enough for a 29 gal tank? I'm going to go with the flourish dark, the more tan and less black look. It will of course be a planted tank. I know changing the substrate isn't really recommended, but I'm going to order a lot of plants. I'm going to wait till my plants get shipped to me, then all at once change the substrate and add all the new plants plus some of my older ones. Another reason I'm doing this is because I want to get rid of my black hair algae and my green spot algae. After this change I'm going to stick with a natural/low tech set up with 2 24" lights, one 6500k and I'm going to play around with what the other will be. And with only adding flourish comp twice a week. The second time might be just a little under recommended dose.