Today I tested nitrates and they were at above 40ppm. The test read RED. I did a 50% water change, tested, same result. Waited 4 hours. Did another 50%, tested, RED STILL. 5 minutes later, did another 30%, STILL HIGH NITRATES. I'm actually baffled. How is this possible? My tap water has about 5ppm in it. I used Seachem Safe which removes ammonia, is it converting the ammonia to nitrates? I'm so annoyed, my fish are clearly on edge and skittish from the high nitrates. Don't even ask about my stocking, after all those water changes the nitrates should be at like 10ppm. It's a 29 gallon planted tank might I add.