Our average used to be 5.0 ppm
now it's between 0 and 2.5ppm
We use test kit Reef lab by Red Sea
Our setup includes 29 gallon with 30 pounds of LR
and 40 pounds of Live Argaonite sand. We have a HOB
CPR refugium with 2 pounds of live arganoite sand money plant macro algae. We also have Maiden's hair macro algae in the main tank. We have also developed a lot of coraline algae on the glass of the tank. The live rock is covered completley with coraline. We also have a CPR BakPak skimmer.
I really think what helped us with the nitrate is refugium and the macroalgae, noticed a big difference after that. We have a variety of soft corals, no hard corals.
We've tried cutting down how much we feed which has helped out big time on the red slime problem we had.
Oh and we also use RO
Hope this helps.