My apologies for this photo bing "Proudly hosted by photbucket" right in the middle of the part I wanted to show (the color of the test). This test shows the nitrate level for the effluent of the sulphur (or "sulfur") reactor (yellowish - around 20-10 ppm) and the tank water, which is (Who can say, except that it's not yellow). This will take a LOOOOONG time, but at least it's something. Considering I started at over 200 ppm for the display tank, this seems promising. Also, I tossed a chunk of chaeto into the sump and started lighting my sump again, so let's hope all this stuff helps. V PS. Who's brilliant idea was it to provide small round testtube that reflect and refract light in every direction and are impossible to compare with the "color chart".