Hey guys, I got my friend a fish tank for her birthday, I was just wondering what the minimum nitrate reading should be, as she rinsed the gravel and sponge filter, UNDER THE TAP!!! jawdrop: I'm guessing all the g ood bacteria would be gone, so maybe I'll just give her some of my gravel to help the cycle along, but yes what should the nitrate reading be? I haven't got ammonia or nitrite test kits, which is why I'm not asking for what the levels should be. But that is 0 anyway right? Thankyou for your time!!