You could do it any way really. I put mine on the bottom with a layer of small gravel on top, but you could just use the flourite by itself or mix it with a similar sized gravel. If you ever need to rearange/replant the substrate will become mixed up anyway. As far as just placing it around the plants, I would just cover your tank bottom with it so you won't be restricted to where to put more plants or from your extra cuttings.
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