When i put the driftwood in my tank, it turned the water a dark brown stained color , the driftwood i put in the tank were extra large , ie ,the stump and root system on the largest is over 2' high, and as big around as a basketball, the roots atached barley fit in the 4' wide tank. I used a power washer first then some large rocks to hold in place. to clear the water up i used a lot of charcoal in the filter, looks really nice now.