Aquaponic Gardening

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Does anyone know what the pale red coating on hydroton is made from and if it's harmful in any way? 

I rinsed my hydroton and got most of it off before adding to the media bed, but there's still some hanging around and on my fish tank bottom and walls.

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Probably some sort of oxide from the process in the kiln.  Not harmful though depending on what kind it might affect the pH a little in the very short term.

Hydroton is, according to the manufacturer... both pH and chemically inert...

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