well I dont know about the params in the other tank, it was from RC in edmonton, so I'd assume the params were good, but I couldnt be precise on the numbers
but mine are
ph 8.2
CA (low) 320-340
Alk 11
nitrates and nitrites 0
ammonia is 0
phosphates 0
dont know about my magnesium, but I know it has been lower around 1095 in the past.
Salinity is 1.025-1.026
edit, guess they arent "spot on" since my CA is a bit low, and mag is most likely low as well, it usually has been. I have some Reef advantage Calcium(Seachem) that buffers ph and Mag, and Strontium