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Would HC "cuba" grow in gravel substrate? Looking at the image above, his substrate seems to be black gravel.

HC is a no-no without co2...alas I found that out the hard way :/ *sigh*…but it will grow in gravel and I think the look is good enough to warrant the $30-$40 price of a decent DIY setup for a tank your size...what's stopping you from going that route? DIY, that is.

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