I love the Mopani driftwood I got from DrFosterSmith in my tank. Since I boiled it for about 2 hours and let it dry overnight before putting it in the tank I didn't get a lot of tannins at all. Nothing that I noticed since I do regular water changes every 5 days or so anyway. Also, all I did for my backround was a black piece of construction paper at my local Arts & Crafts store that was like $1 for a HUGE piece that I just cut to fit my tank... if it gets wet and ruined I'll pay another $1 and remake it... no big deal. I really love having the black backround though, it makes everything else in the tank look that much better.