scottward;54784 said:I once had plain inert gravel but switched to Flourite as I had trouble getting E.Tenellus to carpet. The stuff is taking off now, but I'm still not sure whether it's because I am dosing CO2 better, the iron rich substrate, or a combination of both? I'm thinking a combinationo of both? Flourite is a pretty decent middle-of-the-road option isn't it? I believe you can also mix Flourite 50-50 with plain gravel?