Pretty sure. I've had that driftwood in there for several months now. I mean to some extent maybe. It did turn the water to a bit of a tea color to begin with but that had started to fade away after the first month or so(I soaked the driftwood for a couple weeks before putting it in there).
Some of the color may still be from that, but I think there's almost a greenish tint to the color the water is turning. I mean the tea color hadn't completely gone yet before it started getting darker. I think the color may be a combination of the two things but it still definitely looks brown.