About how long should it take before you start showing Nitrites? I tried to seed my tank and I am showing 0 Nitrites after a few days. I'm in no rush, but I don't want to wait a week or 2 just to find out that I never seeded my tank properly. I added some Cycle by Hagen and bought a potted plant hoping that the sponge material in the potted plant would hold some bacteria. The store wouldn't give me any gravel or filter media .