Sand and Safe-T-Sorb are different weights. You might start with them mixed, but they will separate. Sand on the bottom, STS on top. It will take a while to separate.
STS by itself will hold a lot of nutrients for the plants if it has a source of those nutrients.
Sand has no cationic exchange capacity. So it does not hold nutrients.
The mulm that is in the sand might hold the nutrients. Organic matter that is very well broken down has cationic exchange capacity.
Whether any of this will help with plants that tend to grow aerial roots, I have no idea. I think some plants tend to do this a lot, and the substrate does not make a difference.
STS by itself will hold a lot of nutrients for the plants if it has a source of those nutrients.
Sand has no cationic exchange capacity. So it does not hold nutrients.
The mulm that is in the sand might hold the nutrients. Organic matter that is very well broken down has cationic exchange capacity.
Whether any of this will help with plants that tend to grow aerial roots, I have no idea. I think some plants tend to do this a lot, and the substrate does not make a difference.