Join Date: Jul 2004
Location: Laurel, Maryland
Calcium Deficiency Possible with Onyx Sand?
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.