Nitrates at 0 is quite an achievement.
Most people accept anything up to 20ppm.
I used to run at 20ppm before adding another square foot of 6 inch DSB. That put me down to 10ppm.
I sold or gave away all of my fish and CBS last week so I can concentrate on my corals for a few months. Nitrate was 0 within a day of getting the fish out of there.
I am now feeding the tank about half the food the fish used to get. This feeds the corals and the de-nitrifying bacteria that I need in the tank for when I re-stock.
Well done on your efforts. Great to see and record for everyone.