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pebbles, substrates -

The best pebbles to use for the drainage (bottom) layer of your terrarium are porous and lightweight substrates such as hydroponic clay pebbles ('pon' or 'leca') and perlite. These allow for greater root health due to the airier environments they create and absorb water well so that you don't have a pool of water flooding the bottom of your terrarium. Heavier pebbles or gravel are best placed on the surface of your terrarium as decoration only, but you can use these for drainage layers if you wish as long as you keep a watchful eye on the watering levels and even hide a layer of perlite or pon between the sphagnum moss and soil layers.

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