100% Flourite or 50% Flourite with 50% black sand???

The title says it all... I planned on layering the two substrates but now
that I've washed the flourite and threw that in, I kinda like the look of
it! Is all flourite any more beneficial than layering it? Will the sand
keep the flourite from clouding?

Also, I figure I have enough flourite for a 2 inch covering. Is this deep
enough for a planted tank? I also have about an inch of nice black sand I
can use if the 2 inches isn't enough..

Help!

Phil...