Can I use activated charcoal made for fish tanks?

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milky

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I have a bunch of it and no fish at the moment. Of course it will have to be ground up somehow, but I think it's the same stuff. Would grinding with a mortar and pestle get it fine enough? Is it okay for it to be a little "exfoliating" or does it have to be like a mica dust?
 

DeeAnna

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Yep, but sieve out the bigger pieces. If you use a mortar and pestle, the grinding surfaces may be permanently darkened.
 

milky

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Awesome. Thanks for the tips! What about using a food processor? No coffee grinder anymore.
I'm thinking that if any pieces are as big as poppy seeds then they would be scratchy in a bad way. Hope my sieve is fine enough.
 

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