Reef calcium

Hi everyone, I am sure questions like this have been asked many times but I am going to ask anyway. I have a mainly fowlr tank right now but I am starting to dabble in coral keeping. I have two frags right now. I have a small hammer frag and a zoa frag. My main display is 190 gallons with a total water volume of around 250 gallons with my sump. I do water changes every 10-14 days of approximately 50 gallons. I also run a two little fishes 150 gfo reactor along with a large basket of chaeto. Currently my water readings are :
Ammonia-0
Nitrite-0
Nitrate-0-5
Ph- approx 8.1
Dkh-12
Calcium- 360-380
Magnesium-1600

SO my question: I believe my magnesium should be around 3 times that of my calcium. Is my calcium too low? I have read conflicting reports on calcium and I am confused to say the least. I have Seachem reef fusion 2 part dosing but I am not sure if I should dose both, if I can just dose the calcium, or should I not worry about this right now if my numbers are okay. Any help would be greatly appreciated.