My 15 gallon aquarium has be cycling for 23 days. I have been using Aquarium Pharmeceutical's Ammonia Test Kit. For the past 7 days, that kit was reading 0.5 ppm
and the Nitrites have been 0 ppm
(also using Aquarium Pharmeceutical kit). Out of curiosity, I took a water sample to my LFS
for an ammonia reading. He got 0.25 ppm
using Mardel test strips. Is that difference possible? Has anyone used Mardel strips?