NEW TANK need help plz!!

[gooyferret]

I just setup a 58gal, with a 20gal sump, five days ago and tested the water today. My PH level is at 8.2, amonia is 1.0, nitrite 0, and nitrate 0. Im jus wondering if these are good results for the time it has been set up? Another question i have is my overflow box is a CPR 300gph, and my return pump is a rio 2100. For some reason it seems that my overflow and return pump fluxuate on speed of draining and returning the water, but i cant figure out why? For example, i can turn down the flow for my return pump, and the overflow will be fine, then for some reason it seems to not syphon as much, why is this? Another question is a overflow box supose to have a little air inside or not, because i can seem to get all the air out?

thats all for now, thats for looking and leave a reply plz i need help on this, the sump is being a major pain!