Add laterite or flourite to sand?
I've got a 55 gallon tank, pressurized c02, 2.6 wpg, moderately planted. Currently my substrate is 100% play sand, about 1.5 inches deep. I'm not very happy with the looks of the tank so I plan to rearrange the plants, driftwood, layout. When I do this I was thinking of mixing laterite or flourite with my existing sand and adding another 1.5 inches of sand on top. What would be better, flourite or laterite?