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havent seen black calc carb and would questions its existence

lol i found some 2mm black from aq r us and also found they are the cheapest for just about all gravel

it was nice stuff made my elec yellows and kingsizei look fantastic but did nothing for my fronts

peter

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the substrate sold as black calcium carb is more dark grey in colour than black but it seems to have the same pH buffering qualities as the regular calcium carb. i have seen pics of a tank on another forum with black marble chips as substate... looked very nice but i imagine it was quite expensive.

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