10ppm-15-ppm
Nitrate starts getting toxic towards fish at 40ppm.
--
**So long, and thanks for all the fish!**



"Phil Bassett" wrote in message
...
Hi,

I have had a Mbuna tank set up for a few months (post cycling) and have
been
doing 25% weekly - 2 weekly water changes to maintain by NO3 below 20mg/L.
I
just wondered what other people try to keep their NO3 at?

Cheers,

Phil