That is exactly what I am experimenting with now. What kind of paint do you use for the rocky effect? I have tried ocre tint but its too creamy in the end so I stuck sand on top but it isn't very permanent. I have a pic but as I said it wasn't the desired effect. I am still experimenting.They are pretty easy to make. Shape some foam add tile grout, paint and seal with pond tite. Not to difficult as long as you can deal with the mess of the foam. Im making some more so ill keep you posted. There is good instruction on www.dramaticaquascapes.com.
Cheers
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