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<p>are partially or fully enclosed glass containers that are self-sustaining closed ecosystems that can be made or purchased. They can include tiny <a href="page.php?w=shrimp">shrimp</a>, <a href="page.php?w=algae">algae</a>, <a href="page.php?w=gravel">gravel</a>, decorative <a href="page.php?w=Exoskeleton">shell</a>s, and <a href="page.php?w=Gorgonia">Gorgonia</a>.</p>

<p><big> Weaknesses </big></p>
<p>Closed ecological systems often remain unstable due to low biodiversity, as they contain far less species than natural ecosystems. They also lack the redundancy</p><p>
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