Join Date: Jun 2007
Location: Tsawwassen, BC, Canada
I have used both, and I find the sand better for ease of planting, and for ease of keeping somewhat clean.
I found regular Flourite gravel to be a little sharp/rough on my corries, and then the amount of mulm that built up in the substrate was quite high (though the crypts loved it).
I also found that Flourite gravel was a pain in the ass for planting some things, and you actually would damage root systems when trying to push plants down into the substrate.
I would go with sand, personally, and use the addition of root tabs for added nutrients.
Remember, you don't actually really vaccuum the gravel in a planted tank too much, or at all, but if you do find there is mulm built up on top of the sand, just skim above it with some airline tubing and your good to go.
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Ehei-Pimpfen 276 yo!