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Nitrate limited?


I use the Tetra Nitrate testing kit.  It has read 0 since I got it.   The 
next readable measurement in the kit is 12.5.  I was wondering what a better 
kit would be.  Has anyone dealt with Hach?  Which particular one is the best 
for us?  Also, my tank has been reading 0 phosphates ever since I started 
testing with the Dupla kit.  Does anyone know how to supplement the tank for 
phosphates?  What dose?