Rookie with a test kit

[joshbbert]

OK sooo after testing everything twice its not looking right
Salinity: 1.025 (redsea pro)
Ca: 490 (redsea pro)
KH: 10.5 (redsea pro)
Mg: 1600!! (redsea pro)
PH: 8.1 (Hannah checker)
p04: 0 ppm (crappy api so not accurate)
N03: 0 ppm (same api kit)
Ammonia: 0 (api)
Temp: 78°
This is on week old water
I've always water changed every Sunday 20% aquavitro salt rodi water. Perhaps I should make it every other week? I see no reason to change water today and I feel like my Ca, Mg, and alk are all too high right? I'll get some more accurate kits for nitrates ect. But for now it's the big 3 that concern me thanks for any input

 

[joshbbert]

Now that I think about it, is it possible my phosphates and nitrates are a bit high and its making it difficult for my corals to use up the CA Mg and KH?