The Planted Tank Forum - View Single Post - Cheap dark substrate
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post #8 of (permalink) Old 09-21-2012, 01:56 AM Thread Starter
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I have a few small spoonfuls of crushed coral in a filter bag and it's offset the tannins released by the mopani in my 20g.

I'd be interested if anyone has tried a piece of holey rock in their tank and in the net effects on the water parameters.

Otherwise, I might just go with a few bags of Flourite Dark.
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