I have a 20 gal. tank with a few plants (not doing great but surviving) and a few fish
(12 small, 3 cory cats, & 2 midium angels) which seem to be doing fine. NH3 and NO2 are
not present, NO3 is 200 ppm (that's as high as the test registers). I am using an UGF
with 2" of gravel, 150 powerhead, and an external box filter (with carbon). After
changing water (25%) the NO3 is still at 200 ppm. I have been overfeeding like most
beginners but have cut back tremendously. What do I need to do to lower NO3? I suspect
that I will need to empty the tank and clean the gravel (sweeping apparently isn't
enough). Is there an easier way?
Also, I purchased some "aquatic plant food" from a local pet/fish store (probably a bad
idea). The tablets contain Nitrogen, Phosphoric acid and Potash. When I use the
tablets as directed it raises the NH3 from 0 to 2-3 ppm. Is this nornal when adding
One more question while I am asking. Where can I find an iron test kit to test the iron
in my water?
Thanks for helping a beginner!