issue with calcium/magnesium

02tts

New member
folks, need some help please...I have a 265G tank in which I dose kalk using a drip system of about 2 drops per second, this maintains my pH at around 8.15 (night) to 8.20 (day) but it seems I'm not able to raise my calcium levels past 370-380, I have checked my magnesium levels and they were low, 960, so I raised it over several days to 1300 but I'm still having issues maintaining high calcium, my questions:

BTW, I use a Salifert test to test magnesium.


So:

1. does magnesium go down overnight/weekly - is this something that I should be testing daily and/or dosing daily/weekly?

2. am I not dripping enough kalk (when I meausure the saturated solution it measures at 1500+ on the calcium and 12.89 in pH - I have digital meters for both, they are new and calibrated - chemical tests show the same results)....? should I be dosing more?

3. if I were dosing too much kalk, which I don't think based on the size of tank and drip speed, but if I were, would that bring my calcium and magnesium down?

oh yea, and alk is at 3.75 meq/l - using an Instant Ocean test kit along with a NatuReef test kit.

I have being doing lots of reading from advancedaquarist and reefkeeping.....but I just can not make sense as to why I can not bring this up and keep it there...


other values:

temperature - 79 degrees
salinity 1.021 - measured using refratometer and digital meter
phosphates - 0
nitrites - 0 - measured used nutrfin kit and also instant ocean
nitrates 10 - measured using nutrafin kit and also have digital meter
lights on for 8 hours a day

any help would be immensly appreciated!
 
Last edited:
This is the wrong forum for this question - hence no replies! try the reef chemistry or reef discussion forums.
 
The alk. seems good which would play a big role in it. What are you dosing and how much are you adding?
 
Are you keeping SPS? If not, 380 is fine. Most folks I know with large tanks, use a calcium reactor. I just dump in 12-1 tbsp Pedlow/day into my 90g.
 
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