Hi all, I am looking to add tannins to 2 of my tanks. The first is to be a 36-gallon semi-aggressive community tank that will include angelfish, panda cories and some yet undetermined dwarf cichlids and perhaps dwarf gouramis. Is there good products to use, perhaps something that I can add to my filter or substrate. I have a new piece of driftwood that I added to my tank and it is turning the water a light tea colour. My second tank has 2 GBRs, 3 longfin Bronze Cories and a school of something to be added soon. How much tannin do I want to add? Is it just enough to colour the water or should it go really dark? anything else that I need to know? How often will I need to re-add the tannins1 to keep the water healthy ?Will the use of tannins change hard water to soft water? Is it inappropriate for any of my fish? DOes anyone have any fish suggestions to complete my tank?