Bought these to replace river gravel in a 5.5 gallon aquarium. I used 1/3 of the pack to cover the bottom of his tank with about 2 coats and it looks amazing and smooth. I assume these rocks are easier to clean each month and definitely don't slide through the filter holes like the gravel I switched from. A few stones (1-5 handfuls of stones I used) arrived chipped but were easy to put aside.
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