IMO sinking some rocks of even DW(terracing) helps maintain the slope, having plants that have strong roots will help holding the slope in place.
As to having thick substrate and adding soil/gravel; lower the water during water-change would help, cloudy water normally will clear within a few days.










But as CNY is really getting near, I think I will just let the current scape be as it is and let the plants grow nicer before 'operating' on them again after the CNY period.
), C.nurii, C.parva, C.pygmaea(Melted!
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But I quite get the idea of saving money on buying substrate material... 



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