05-21-2007, 09:23 PM
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I have three blackwater tanks. I have heard of using oak leaves to make a tea to add to the water. I have never used this method, nor do I know of anyone, personally, who has. I use Tetra's Blackwater Extract and filter over peat. I also use a softening pillow in my power filters to bring the pH to the desired level. Be sure to follow the directions on the box if you use the softening pillow. You cannot use carbon in your filters if you use any type of tannic extract in your tank as the carbon will filter it out.