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[APD] Driftwood, tannins and calcium deficiency

My aquascape contains large pieces of massive driftwood.

Question: Does the leached tannins chelate Ca/Mg 
rendering it useless to the plants but still can be 
measured by GH and Ca-tests?

(My snails get less translucent when I dose CaCO3 or
smashed chalkboard crayons, and the Ca-deficiency
gets less visible in the plants. More frequent waterchanges
seems to do the trick also.)

(Something is messing with my Calcium, so I will not
give up on this 8)

// Daniel
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