Flourite or not
I almost piggybacked onto one of the posts below because I was about to do the same thing (add flourite to a pre-existing tank). I have an inch+ of organic soil on the bottom capped with an inch+ of brown gravel. I was going to add the black flourite mainly because of the color and I wanted the colors in the tank to pop more and because it would be good for the plants too. I'm guessing if I do that I need to rinse the heck out of it first though right? Or does adding flourite into a system that has that much organic soil already - is that a problem?