Originally Posted by N.Galvin
Hi i shake the bottle till my arm aches like hell haha
I got the reading wrong i tested nitrate when i got home and got a reading around 20-40 ppm
Yeah I understand. You can tap the bottle on a hard surface too. A lot of people on this forum give 0 on nitrates, but that's impossible. I had this issue before I knew it.
Fish constantly release ammonia into water, that will soon be converted to nitrites then to nitrates. So for sure you have at least 0.1ppm nitrates if u have > 0 fish. It's possible to have 0 nitrates only by changing 100% of the water. My tank is very heavy planted and I never less than 5ppm - 10ppm.
Before your fish dies, do they look healthy ? Do they die after a water change ? Temp change stress fish. DOes your PH is stable ? Unstable PH stress a lot fishs.