The Planted Tank Forum - View Single Post - What's the best sand substrate for plant growth?
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Old 08-03-2009, 02:49 PM   #2
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"Sand" usually refers to a substrate with smaller particles than "gravel". Flourite has regular size particles and a "sand" version with smaller particles. "Play sand" tends to include very fine particles, almost like dust, while "pool filter sand" has particles all within one size range, somewhere around 1 mm particles.

With those definitions: the best "sand" for plants is probably Flourite black sand, because of its high CEC. Whether anyone has shown that Flourite black sand grows plants better than pool filter sand I don't know, but theoretically it should.
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