Matthew C.
Aquarium Advice Activist
I am planning on doing a water change in the next couple of days...it is a 29.9 gallon tank with 13 glofish tetras, 5 lamp eye tetras, and 3 emerald green cats....I usually do a water change on the average of every two weeks....my vision is somewhat to be desired of....can someone please give me a reading for my nitrate test....I'm think 20 ppm or more....what is your opinion of the reading....I have attached a photo.....thank you.