Does anybody use peat granules or similar as a filter medium? I have read that it can release valuable humic acids and trace elements into the aquarium, in a slow-release manner. I realise it will also lower KH and pH, but this will making the aquarium conditions better for for species from soft, acidic water regions (i.e. Amazonia). Also peat is claimed to inhibit the growth of fungus, bacteria and algae. Any comments appreciated.