IMO, the main thing is you are not indicating ammonia or nitrite. I wouldn't bother measuring pH or nitrate at this point. Keep up on frequent water changes and keep testing for ammonia and nitrite. 6-8weeks down the road, the tank should produce nothing but nitrate.
Sorry if it's been mentioned, but what type of biological filtration media does this tank have? All I see is some sort of under gravel filtration. This will eventually work as bio media too as beneficial bacteria will form in/on the substrate and all hardscape, I was just curious if there's other filtration on this tank.