Revoreef 3DM reef sand

[rainbowreef]

Hi all, it has been over 6 months since I added revoreef 3DM reef sand to my nano tank. I have been able to establish the consumption rate of Alk by my corals and have started to dose alk supplement. However, I have measured fluctuation in Cal between 420ppm - 500ppm without dosing any Ca supplement. According to Qi Hu's website about the revoreef sand, the artificially manufactured sand contains minerals and trace elements, specifically mentioned CaCO3, MgCO3, and Mn. I wonder if it's the sand that has been causing the fluctuation, and if so, is there anything I can do to combat the issue? Thanks in advance for all advice. 

[rainbowreef]

Just a quick update. I'm still having problems with Ca fluctuation and I'm contemplating to remove the 3DM reef sand. I have measured my Ca for the past few days with Salifert Calcium test and have got 370ppm on Thursday, 350ppm yesterday, and 400ppm today. I have not added any Ca supplement as I'm unsure about how I can dose with this Ca fluctuation. Would be great if anyone who had or is still using this substrate to share your experience. As of now, I will be cautious in using this sand again in any reef tank, but don't see any issue using this in FOWLR system. 

[Asteld]

Just give it some time , my ca was at 680ppm 2 weeks ago and i tested yesterday it was down to 500 already, probably cause of my clam.


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[Harlequinmania]

Maybe u would also want to check if the issue was due to your test kit as well ?

Try get another test kit brand or do two same water test on the same day to see if it tally.

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[sherman]

Or get a reference fluid to check if your test kit is reading right