Ok so, I got particular pieces of wood that have been cut off and washed off into the creek.. I am currently using them in my tank to create a biotope black water for my tree spot, white skirt, and my Inverts. the woods still have their bark tho, and several people online said that it is not safe because it decomposes very quickly, thus may release some harmful compounds like ammonia and pollute the tank. I have seen some examples of biotope aquariums with woods that still have their bark now im confused. Did I do something wrong? I still have time to remove them and remove their barks.