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>I have recently started dosing my tank with kno3 and was curius roughly
>how much kno3 is recomended per gallon in a heavily planted tank (72
>galllons). I have been pouring abount 2-3 tsp worth twice a week and
>still have unmeasurable nitrates.
It will vary for every tank, but that sounds high. I'd check your test
kit. Test within a couple of hours after adding the KNO3. If it _still_
doesn't give you a reading, I'd suspect the accuracy of the test kit. If
you can see the level going down over a period of time, you really _are_
using it up. Still, depending on your substrate, just because you have no
nitrate in the WATER doesn't _always_ mean the plants are nitrogen
deprived. Watch the plants and let them tell you how they're doing.
Aquatic Gardeners Association