PH
PH fluctuate throughout the day. early in the morning, it is lower.
after you lights are switched on, it will rise by 0.1 or 0.2
If you would like to increase, you can add some PH buffer, Kent marine pro-dkh.
but I think 8.0 is ok really. What water are you topping up with? If you are using tap water + water conditioner, you should be quite ok cause tap water has quite high PH.
nitrate
10ppm is ok. dun have to lower. If really want, do more frequest WC.