Nitrate level {whats safe}

[lizardfishman]

aim for below 20ppm

 

[gomezladdams]

My home tanks are always 10 or lower(private well wooded area),but I take care of a small tank at work and the water there(town resevoir,agricultural area)comes out of the tap at 20.Im only at that site sundays ,when I miss a day fish die

 

[neegeeboo]