Ca and Mg Question

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QuarantineReefer

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So I just tested my tanks Ca and Mg levels for the first time tonight. It's currently cycling (just in case that changes things) but from what I am seeing it's just about cycled. I tested my Ca at 380 and my Mg at 1215. I found a chart somewhere on here I think that says those numbers fall in the recommended range. But they are at the absolute lowest end of the range. So I guess I was just curious if these will be okay or do I need to try to bump them up a bit so that they are more in the middle of the range from the chart I found. If the chart is even giving good numbers to go off of.

Here is the chart that I found for reference.

20200323_215815.jpg
 

90's reefer

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Since you are almost done cycling I would get some 2 part, mag, and adjust to the levels you want to run and then keep them their.
Same with alk.

I just looked up rpm.
The ca and mag levels are lower than what they say it should mix at but not that far off.
When running a 1 part salt make sure you mix it up before use. Some settling may have happened.
I would check levels of a new batch.
If they are what rpm mixes at the a couple water chamges will bring them up easy enough.
 

Randy Holmes-Farley

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He mentioned it was mixed to 1.026.
Not sure if it was tested or assumed.
Oh, I see yes. It may be lower than he thinks, or the Salt mix is off (less likely).
 
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So I test daily just to kind of give my self something to do during the cycle period and the salinity fluctuates between 1.025 and 1.026 on my refractometer. I just bought the refractometer from my LFS when I mixed the first batch to start the tank. They didnt have any calibration fluid so on that end I am kind of at the mercy of wherever it was set from the factory. Sorry for the slow responses on my end, been a busy work day. Thanks for all your guys help!
 

Randy Holmes-Farley

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So I test daily just to kind of give my self something to do during the cycle period and the salinity fluctuates between 1.025 and 1.026 on my refractometer. I just bought the refractometer from my LFS when I mixed the first batch to start the tank. They didnt have any calibration fluid so on that end I am kind of at the mercy of wherever it was set from the factory. Sorry for the slow responses on my end, been a busy work day. Thanks for all your guys help!
Calibration with RO/DI is likely to be a lot better than factory random. lol
 

Spieg

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Also probably worth mentioning that temperature can affect salinity readings. I'd highly recommend getting some calibration solution in near future. Two Little Fishies sells a product called AccuraSea that is actually bottle sea water and can be used as a calibration solution for salinity, as well as calcium, alkalinity, magnesium, etc...
 
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QuarantineReefer

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So I will get some of that solution coming. I did try to RO/DI water I got from the LFS and it read dead on zero. So for the time being until I can get solution hopefully that's close enough for a semi accurate salinity reading?
 

Randy Holmes-Farley

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