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Hiya, I've been messing about and in two experimental tanks I've had success using local clay "soils" topped with play sand. I'm wondering if anyone else has used clay as a substrate before and if you think doping the clay with fertilizers beforehand would work.
 

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Lots of people used to use clay balls, with fertilizers in the middle, as a root tab. And, they felt it was very effective. I don't know if anyone still does this, and I never have done it, but putting some fertilizer in a clay underlayer would be similar.
 
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