I have a 34G with 25 lbs of LR and 20 lbs of sand. The tank will be 2 weeks old this Wednesday, and all levels are where they should (8.2, pH, 0 Ammonia, 0 Nitrites) be except nitrates which is around 20-40. I did a 10% water change 2 days ago and it didn't seem to change the level that much...