Why do my Neon tetra's always die in the night?
Question: My tank is recycled and ammonia, nitrites etc are 0.00, nitrates have been a dollop of high and my pH is 6.0 to 6.5
I have a 27G hex, with 19 fish in the tank here is what I have.
Answer: The chemistry of a fish tank in the dark Cimmerian changes. The pH may drop, especially with plants as they stop absorbing CO2 and begin to relax.







