I just started rough drafting a web page that lists. A drainage layer will help to ensure that the bottom layers of the substrate do not become waterlogged and foster bacteria and fungi. This is wordy, but it gives a good introduction.
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The Ultimate Bioactive Terrarium Drainage Layer Guide
In most cases, gravel makes the best drainage material.
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Petsmart.com has been visited by 100k+ users in the past monthWeb drainage layers are the first step in a tropical planted bioactive terrarium, while not necessarily needed to provide a planted terrarium drainage layers do help provide. Web an introduction to bioactive vivaria.Web with the proper bioactive substrate the water will go through the substrate into your needing a drainage layer in the enclosure.