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My reineckii and previously some sunset hygro have been showing cupped and twisted leaves that look like a calcium deficiency. I thought this odd, since onyx sand is my substrate, and that stuff has a very high content of calcium and magnesium. Does there need to be calcium present in the water column, the onyx doesn't leach and the roots don't take in enough? I've come across talk of excess K causing a calcium uptake problem and I tried not dosing any K with no change.

I'd post my specific parameters, but heh, I'm colorblind, and there's nobody around to help me read the charts.
 

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I have had this same problem when I dosed additional K (beyond what the kno3 provides) and I have crushed coral mixed with the substrate and also some in the filter. How long have you refrained from dosing K? Are you dosing enough traces?
 
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