NetMax wrote:
"Elaine T" wrote in message
m...

Mario wrote:

Despite some pretty intesive searching, I cannot seem to find any
guidelines (and I'm not even looking for anything *definitive*), on
what constitutes "too high".

I'm about 10 days into a new 20-gal tank with 3 zebra danios. In
addition to keeping an eye on fish behavior, I monitor the pH and
nitrogen levels just about every day. NH3 levels are starting to rise
(still 1ppm) and NO2 is zero.

What NH3 value is considered "too high" where I should perform a water
change?

How about for NO2 (nitrates)?

Thanks in advance,

Mario


Problem is, the toxicity of ammonia is changed by the pH so there is no
single answer. Fish tolerate NH3 much better than NH4+.


Just a typo. I think you had that reversed, as NH4 (ammonium at low pH)
is not toxic and NH3 (ammonia at high pH) is very toxic.

D'oh! Thanks so much for the fix!

--
__ Elaine T __
__' http://eethomp.com/fish.html '__