Nitrate readings in planted tanks

[Squimps]

I was just wondering where all of you gardeners like to keep your nitrate levels. I've come across various opinions on this and am interested in what you guys think.

 

[Alien Anna]

Some of my fish are very nitrate sensitive but I try to keep my nitrates at 10-25ppm for the plants, and I've had no problems.

 

[mrV]

Trying or not, but it's about 10mg/l always However, some plants don't tolerate high nitrate level, for most plants 2-10mg/l is enough. Even some plants die if the nitrate is higher than 3-4mg/l.