What issue arises from the particle size of gravel if uneaten food settles deep within and is not addressed?

Answer

Anaerobic pockets forming.

The gaps between gravel stones allow fish waste and uneaten food to settle deep within, which necessitates diligent vacuuming to prevent the formation of anaerobic pockets.

What issue arises from the particle size of gravel if uneaten food settles deep within and is not addressed?

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