My tank has cycled and is doing well... the only problem i have with levels in the tank are high nitrate levels. I had been using an AP nitrate test kit, which was giving results between 80 & 160... and following advice on here, I went out and bought a second test kit.
My salifert no3
test kit result comes out at a much lower result than the AP test kit (which i have been told may be due to age). The reading is: a colour between 25 & 50...
Either way, such a high nitrate reading is surely cause for concern? I have no idea what is causing the high nitrates or how to lower them? I've seen a couple of people mention kent's nitrate sponge... would this help?