Planted Tank Guru
Join Date: Jan 2010
Location: Contra Costa CA
Each person has their own idea of what is best.
I would highly recommend you get a substrate with high cationic exchange capacity. Flourite is one. CEC means the substrate can hold fertilizers as a reserve and sort of even out the supply.
If you go on vacation, for example, there will be a reserve of fertilizer for the plants to draw on.