Do you put gravel on top of substrate?
Thibaut Guillot
2025-08-09 07:26:53
Nombre de réponses
: 13
You can use volcanic substrate in an aquarium as the sole substrate with no outwardly negative effects.
Having it as the sole substrate provides the benefit of allowing plants which depend on more absorption from their leaves rather than their roots.
However, people commonly use more attractive gravels or sand to go on-top of the volcanic substrate.
This looks more aesthetically pleasing as well as trapping the nutrient in a “soil” bed, allowing easy access for root plants as well as dosing fertiliser and macro nutrients into the water column to better cater towards all plant types.
We therefore would recommend that you put a thin layer of either sand or fine gravel over the top of the substrate.
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