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Why does an aquarium need to be cleaned periodically, unlike a natural pond? found in larger natural ecosystems

Question
Why does an aquarium need to be cleaned periodically, unlike a natural pond? found in larger natural ecosystems
Because aquariums contain no biotic components
Because it lacks the full set of natural processes (like extensive decomposition and replenishment)
Because ponds never accumulate waste
Because fish in aquariums do not produce waste
Answer
Because it lacks the full set of natural processes (like extensive decomposition and replenishment)
Detailed Explanation
An aquarium is a small, limited artificial system without the scale of natural processes found in a pond, so waste and imbalance build up faster, requiring cleaning. — Examisthan.com
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