11-11-2007, 03:16 PM
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Keeping a mounded Aquascape like that is a real pain in the fundament. You have to be really sharp with your hardscape: Make sure that the edges are entirely blocked up with rocks, and put vertical slates in the mounded substrate to make it harder for it to subside, then plant the bejeezus out of it with plants that have good root systems and lots of runners. The other thing is you can't put any fish in there that dig in the substrate. I have a lovely tank that had a nice white mount in the middle, and loaches scattered it all over the place.
You'll also need to move the substrate that does subside back up to the top of the mound on a regular basis.