Seachem Flourite Black on top of Aquarium Gravel

Hello all and Happy New Year!!!

I am looking to upgrade the substrate in my 10G column tank. It has been on my mind for a while since it is the only piece missing. I have all live plants and would like to add more but the plants keep rising out of the gravel. Currently, my plants consist of amazon swords, anubias barteri attached to driftwood, rotala indica, bacopa caroliniana, weeping moss and litorella uniflora.

What I plan to do is apply Seachem Flourite Black on top of the gravel for a couple of reasons. 1. to keep the slope for my scape so I don't have to buy too much and 2. to keep the BB in the tank. I guess as far as the plants go while being fed through the water column and root tabs, the plants would be held down by the Flourite black and then have more than enough room for the root to go down and grab onto the gravel below.

Is this a good thing to do or should I just bite the bullet and do all Flourite black?
Here is a pic of my current tank.

 

I don't really deal with live plants, but i think people often do it the other way around with the gravel on top. Helps keep the flourite from floating around so much.

 

I'd be cautious and do a test to ensure the gravel does not rise to the top and the fluorite to the bottom.

 

I just got back from my LFS and decided on using Eco Complete. He mentioned that if I wanted to keep the gravel, to mix a little with the gravel to keep as a 'base layer'. Then apply the rest on top while also making sure that there are root tabs on the bottom.

 

Update on my plan... sort of back fired but I'll take it as a lesson learned for next time. I took out some of the gravel, shaped it so I could put the eco complete on top. Looked good at first but then the amazon sword started to rise and when I went to plug it deeper, the white gravel started to show (women womp). Perhaps I could get a small bag of eco complete to cap it but that will have to wait.

But here it is.