I just ordered this from gchydro.com. The brand name is "Diamond Black". I can't vouch for this place other than that they have it. Its my first order with them and I just placed it this week.
Diamond Black is the stuff. I ordered mine from a local hydroponics store. 12 lbs for $40. If you punch in Diamond Black leonardite on google you will get quite a few online sources.
What % (either by volume or weight) of leonardite should be added to the substrate? Is this mixed with the lower portion of say, Onyx sand, and then covered with pure Onxy sand? I realize everyone is a little different, but with a planted tank, is there a good rule of thumb to use for the required depth of the substrate?
Thx in advance.
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