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From The Aquarium Wiki

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Manganese (Mn) is an elemental metal used in trace amounts by photosynthetic organisms bacteria, algae, and plants, and is essential in the oxygen-evolving complex used in photosynthesis.

Manganese is considered a plant micronutrient, and is often included in aquarium plant fertilizers, enriched substrates, and can be found in fish food such as Spirulina.

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