[Gem Tang Rider]

Just wanted to say that I built a couple of 2' tall x 4" dia coil denitrators almost a year ago.
They do help with the nitrates, but a 2' unit is limited to a 30 gal tank. I run one on a 37gal & another on a 75gal. They do work to keep the nitrates down, but not to "0".
I have the water coming out at about 1-2 drops/second into the top of a spray injection skimmer. This quickly adds O2 to the water.
They do work better than the deep sandbed in my 56gal.