I have black Neon's and they keep dying. My tank water is really good. I read they are bullet proof but they keep dying. Is there something I am doing wrong? Water quality is great. I do not know what I am doing wrong. They are supposed to be hardy fish, but they keep dying. Tanks water is 0 ammonia, 0 Nitrate, 0.5 Nitrites.
I have 40 gallon tank
I have 40 gallon tank