I guess I have a ULNS/LNS? Coral Suggestions? How high is too high for Mg?

[FisheyVetTech]

So I finally set up a serious reef tank. I am no stranger to basic reef systems but I have been out of the hobby for a few years and decided to set up a 40 breeder aimed at keeping some of the more 'advanced' coral species. Starting out I have one issue with low alkalinity and one instance where I accidentally rose alkalinity higher than I should have. I have one heater issue and tank went from 80 to 84 one day and had some fallout from that. Anyways, I think I have worked out the kinks and have a pretty stable system now. Current readings as of yesterdays are:

Ammonia: Not detectable (API Test Kit)
Nitrite: Not detectable (API Test Kit)
Nitrate: Not detectable (API Test Kit)
Phosphate: Not detectable (API Test Kit)
Alkalinity: 8.3 dKH (Salifert Test Kit)
Calcium: 500 ppm (Salifert Test Kit)
Magnesium: 1725 ppm (Salifert Test Kit)
Temperature: 80 Fahrenheit
Specific Gravity: 1.023

So the magnesium seems pretty high. Does that hurt anything in anyone's experience here?

From what I read I guess this is a low nutrient system? Coral recommendations for this system especially if you have personal experience?

Thanks! :reading:

 

[mcgyvr]

Why is the mag so high?
What salt mix are you using?
How old is the tank?

I'd get a second opinion on those nitrate/phosphate as its clear you have some green hair algae issues.. But it seems to be common for some to not register any as the algae is quickly consuming it for fuel..

The key to keeping all corals is stability.. Not necessarily a specific parameter is "X".. But that they stay stable..

 

[Sk8r]

You may have quite a lot of mg in the salt mix: check it. I like mine at 1350. What you're apt to get is coralline algae on your glass. Oceanic salt is particularly high, FYI. The other numbers are pretty good.