Tom (or anyone), I would like to change my present substrate in my CO2 enriched tank (75 gallon, 48"x18"x18") to basically Onyx sand. We will not presently describe what I'm using in it now! I realize that most of the nutrients, using EI, are derived from the water column, and that an enriched substrate, may not be necessary. However, this is my baby. I would like to have a substrate of about 4" of sand , with BD Leonardite added, and ground peat. And hence my questions. How much leonardite (by WEIGHT) should be mixed with the 4" Onxy sand? I believe Tom mentioned that the leonardite should be mixed with the sand at a depth of 1/4 cm to 1 cm (2.54")- is that correct? Then pure Onyx sand is placed over it, forming a multi level substrate? Off the top of your head, how many pounds (or bags), of Onyx sand would be required? I've usually figured out the volume of the sand required, divided by 231 cubic inches, filled up a bucket (of sand) to one gallon, weighed it, then bought it accordingly. Is this as good as any other method? Please, I've been like this all my life, stop giggling. The pains, the constant pains!! 
Now, addition of peat. I called Scott's (now merged with Miracle-Gro) and asked about ground peat, that Tom recommended be added to the mix. They said they didn't have anything they called "ground peat". They did say they had something called Miracle Gro Sphagnum Peat Moss that looked ground up, not stringy. Is this it? Bar code # 32247527835. Would the addition of Flourish tabs be a good idea as well? And the leonardite. I'm in contact with my LFS, but am wondering if anyone has an address for a good online supply of the stuff? Greg, where are you?? Appreciate your tolerance for the long post, everyone have a good day.
Walter :gw
Now, addition of peat. I called Scott's (now merged with Miracle-Gro) and asked about ground peat, that Tom recommended be added to the mix. They said they didn't have anything they called "ground peat". They did say they had something called Miracle Gro Sphagnum Peat Moss that looked ground up, not stringy. Is this it? Bar code # 32247527835. Would the addition of Flourish tabs be a good idea as well? And the leonardite. I'm in contact with my LFS, but am wondering if anyone has an address for a good online supply of the stuff? Greg, where are you?? Appreciate your tolerance for the long post, everyone have a good day.Walter :gw