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Discussion Starter · #1 ·
planning to add more gravel to rise the substrate for background spot (background 2 inch deep > midground 1.8 inch deep > foreground 1.5 inch deep)
is it safe? is there any trouble if i add more than 1.5 inch?I've never seen anyone use more than 1.5" for cap
 

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Nothing wrong with a cap that thick, especially gravel with large open space between the grains.
 
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