When I converted my 20G Long from fish only to a planted tank, I had around 1" of aquarium gravel. I added another 1" of aquarium gravel and 1" of Flourite. That gave me about 3" total for the substrate and you can see by the pictures that the Flourite looks quite nice. When I do my next take I may decide to use 100% Flourite to gain more of the benefits from the Flourite.
20G Long FW Planted Tank
: 40W NO.
30G Cube FW Angelfish / Planted Tank
: 65W CF, DIY co2
54 Gallon Oceanic Corner Reef Tank
:10G Sump, 175W 10k MH, (2)20W Actinics, Berlin Skimmer, Sea Swirl powered by a Rio 2100, DIY Kalkwasser Automatic Topoff.