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[APD] Nitrogen source

Hi everyone,

I am currently supplementing my 240 gallon tank with one of the commercially 
prepared planted aquarium nitrogen supplements. I test with a Lamotte test 

Are there any cheaper sources of nitrogen that would be comparable to the 
commercial products that I could use and still get accurate readings with the 
Lamotte? I am currently using a good bit of N. Hopefully, as I introduce more 
fish and the tank ages I may need to use less, but for right now it is my single 
biggest additive cost.

I was wondering if one of the garden type Nitrogen sources would be a good 
substitue? The aquarium supplements are pure, I assume. That would be my only 
concern about using something not aquarium specific, other ingredients that 
might be harmful in a planted tank.

The tank is 240 gallons, light is metal halide, sump setup, CO2 injection.

Thanks for any help!

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