Undergravel filter for aquarium / půdní filtr do akvária

Bubbles going up in tube with water. Water is drawn in stones and plant roots. Dirt stay here to feed the plants.
In the contest Fish Tank Tweaks
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updated February 7, 2024

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Bubbles going up in tube with water. Water is drawn in stones and plant roots. Dirt stay here to feed the plants.

You have to buy transparent plastic tube separately

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The author marked this model as their own original creation.

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