Oh btw ... the day I bought the SR I took my water to the fish shop to be tested for nitrites and nitrates (well I also wanted then to test for ammonia, but I couldn't convince then to open a test kit for it).
The nitrate sample came back clear ... ZERO! There was a little color in the nitrite sample, but not even enough for it to be classified as the first level, and according to the box the first two levels are still fine for fish.
I'm not sure if I trust the tests though ... especially the nitrate. The LFS didn't really konw what they were doing. They didn't even have a nitrate test kit open and they had to read all the instructions before doing the test.
I'm thinking of taking a sample to a professional water testing company (if there is such a thing) and have a full range of tests run on it..