What to fix first?

[Nhunt]

My calcium is at 360ppm, alkalinity is at 3.43, magnesium is at 1050, phosphates are at 1-1.5. Using Selford Test kits to test just wondering what one to fix first?

[disc1]

Is that 3.43 dkH or meq/L? It matters because if it is in dkH then it is way way way low and that needs to be the first thing. If it is in meq/L then it's not bad and I'd say add a little magnesium and start working on the phosphates.

Numbers without units are absolutely meaningless.

[GroktheCube]

Have you checked salinity? With numbers so low, it may be way below 35ppt

[bertoni]

I agree that we need to know the units on the alkalinity result, and getting a second opinion on the SG and other parameters might be useful, too.

That said, the calcium, alkalinity, and magnesium are reasonable enough that you can dose in any order. I'd probably add some GFO to the system to work on the phosphate, although that level is very high, and I expect that you'll need to do some more serious nutrient control, such as reducing feeding.

[Nhunt]

kh is 9.6 dkh
Alkalinity is 3.43 meq/L
Salinity is 1.024

In my 240 gallon tank
Sohal
2x gold bar maroons
3x cromise
Red hawlk
Foxface
Blue tang
Sailfin sang

In my 75 gallon tank
Regel angel
Morishidol

All one system with that being said I feed the 240 gallon a sheet of seaweed a day and every other day some type of meat shrimp/ clam and on the opposite day NLS. I feed the same in the 75 but just a half a sheet of seaweed and smaller amounts don't let food touch the ground.

[disc1]

kh is 9.6 dkh
Alkalinity is 3.43 meq/L
Salinity is 1.024



With your salinity a little low your numbers aren't bad off. The alk is on the high side of fine. I wouldn't mess with that. I'd bring the salinity up to 1.026 first and then see where the calcium and magnesium comes out. It will be a lot closer to the numbers you're used to people throwing around. Low salinity means everything else will be low too.

[bertoni]

I agree with raising the salinity. I personally would target 1.0264, the canonical ocean average.