I purchased some caribsea floramax midnight from my local petsmart at an outstanding price. However now I am wondering if that was a good choice. It seems that it might be too lose to plant anything into. I am trying to plant some dwarf hair grass and it is a total pita. Should I try to mix it with some kind of sand? The reason I went with it, is because I am told it is good for root feeding plants and I also liked the black color. They also have this caribsea super naturals black sand that I was thinking of buy and mixing with this sand in order to help make the substrate a little tighter so it is easier to plant.