So in my 75 gallon , i bought 3 large pieces of driftwood to put in it. I put the 3 pieces in a cooler outside for 2 weeks changing the water whenever it went brown. So when i thought they were good i put them in, and they turned my tank black, so ive done around 8 50% water changes since then, and the water gets a dark brown color then turns black again. Its really frustrating and im wondering if i should just keep doing a whole lot of water changes, is this my only opttion? Just wait months for it to go away, its been about 2 since i added them. Its mopani wood by the way.