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Is this the right clay to use for iron in a planted tank in the substrate? I asked the pottery shop guy if it has any other additives and he said it doesnt .. but i just wanna know if it the right clay to get some iron in the substrate?
 

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clay isn't really going to do much for iron. If there is iron in the clay, it's most likely unavailable because it's bound up in the mineral structure.

Anyways, adding clay won't really hurt anything, and it will probably give you improved CEC, so...
 
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