Ca, Mg, dkh raising, ph dropping

[thecitadel]

220 gallon display, 120 gallon sump. I don't dose anything other than a pellet reactor and kalk drip. Stopped kalk drip over a month ago. Routine maintenance on all pumps and equipment, weekly water change of 15%.

1 year old system that was put together from a 4 year old system with established live rock.

Salinity - 1.026
No3 - 10
Po4 - .06 (Trying to get down)
Ph - 7.9 as of last night, normally 8.2. As of 9/13 it went to 8.0. 9/16 test was 7.9
dkh - 8.9 normally is 8.2
Ca - 600?
Mg - 1700?

I use Salifert kits. I'll be going to my lfs today and having them test to make sure it's not user error.

Should I be worried? Some Corals look okay, not as happy as usual. Some Corals are fine. Nems are all hiding under the rock and not extended like they usually are. Fish seem fine. Everyone's eating.

I'm just unsure what to do or if I should worry. Thanks guys!

 

[thecitadel]

 

[thecitadel]

Update - Either user error (most likely) or bad test kit(s). Lfs had this

Ph 8.0
Nitrate - 40
Phosphate- 2.5
Mag - 1450
Cal - 350
Alk 8.9

Since Sunday, I've done 2 30% water changes, bought a Hanna Nitrate and Hanna Salinity Tester and turned out to have a Hanna Calcium checker. Tomorrow I'll be back at the lfs to get another test done and get a Phosphate checker. Now I'm reading

Ph - 8.0
Nitrate - 15
Phosphate - .25 (I don't trust it)
Mag - 1500
Cal - 400
Alk - 8.9

I cleaned up my sump, crazy build up since I stopped running socks. I've been running socks the last week and every morning change them out.

I cleaned out my bio reactor as it was super low flow and nasty looking. Started to add back new bio media.

Lfs sold me Rowaphos? I added it to my other reactor, lightly fluidized. I started with 200g. Next day added another 50g and yesterday added another 100g. Seems Phosphate went down from lfs test, but that's based off me testing who originally was apparently, getting it wrong. I'll know tomorrow more but so far everything seems well.