shultz aquatic plant soil

Or in many garden shops. I find that most of them sell it in one variety or another.
In my area there is are a couple of chains that sell it either under Schultz or Turface.
I suggest you look locally for the stuff as it will cost you a small fortune in shipping to order on-line.
BTW, I have a 55 with Flourite and a 55 with Schultz and both tanks are thriving. The Schultz is a bit lighter and a little more difficult to keep plants down in when new, but as it loads up with mulm and bacteria it's weight increases and it's great stuff.
I wouldn't use anything else in a large tank.

Len
 
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