Parameters measured by Madsalt January 29th:
temp 77.6
ph 8.21
ammonia 0
nitrite 0
nitrate 0
phos 22 I need to change my GFO
calc 440
dkh 7
I went ahead and ran his tank water through my own tests:
Salinity - 1.023
NO3 - 24 ppm
PO4 - 0.14 ppm
Ca - 450 ppm
Mg - 900 ppm
Alk - 5.3 dKh
So from the results of the test, it seems the salinity could be brought up a bit. Typically 1.024 - 1.026 is acceptable for a reef tank.
Looks like we do have nitrates in the system at roughly a concentration of 24 ppm. They aren't alarmingly high but higher than recommended for a reef tank. I aim for anywhere between 1-5ppm in my tank but a level up to 10 ppm does not set off any alarms.
We've already discussed the phosphate level and it seems in line with your results of your test that we ran while I was there. Madsalt had just replaced his GFO and even within the 6-7 hours since replacement, it had already brought down the concentration from 0.20 ppm to 0.15 ppm. Anything below 0.1 ppm is what I aim for and if you are keeping a SPS-dominant system, than I prefer 0.03 ppm.
Calcium is a little higher than recommended at 420 ppm but its not a number I would be concerned about.
The Mg is really low and may be due to the lack of water changes and any form of supplementation. A good number to aim for is 1280 ppm.
Alk is much lower than your API alkalinity test shows. It's at 5.3 dKh and acceptable values are anywhere from 7-11 dKh. Again, probably a result from a lack of water changes and any form of supplementation.