03-15-2011, 06:20 PM
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Originally Posted by Byron
Are you aware that sand and gravel will mix, naturally, with the water movement (water flows down into and up out of the substrate) and fish digging? And the smallest item (sand) will be on the bottom with the largest (pea gravel) on top, eventually.
The total depth depends upon the plants. Stem plants require minimal substrate, but plants like swords with extensive root systems need more depth.
I read from Pat that she did that (sand over gravel) and thought it was the best of both. I'm kinda already into it now, as I've put the sand on top of the gravel. I guess I figured it would mix a bit, but as long as I'm not stirring up the sand, hopefully not too much. I guess I better add more sand though, to keep more on top of the gravel. Ugh.