Added as a liquid suppliment? As already pointed out, peat contains plenty of humic acids, but I think this might be a little misunderstood... Humic acids refer to a class of chemicals, just like tannins, its nothing specific... sort of like saying something oxidized -- this isn't a very scientific description of something. You generally resort to saying stuff like this you when have no idea whats really going on.Sir_BlackhOle said:Has anyone tried using humic acid in their emmersed setups? I got some from a landscaper friend of mine and its supposed to be really great for terrestrial plants. I was thinking of adding some to the water in my emmersed tray. Any thoughts?