noun
a person who maintains or cares for an aquarium, typically as a hobby
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The aquarist meticulously maintains the health and cleanliness of the aquarium.
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My friend is an aquarist and has the coolest fish tank in his living room.
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I never knew being an aquarist required so much work, but it's worth it for the beautiful fish.
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As an aquarist of emotions, she carefully tended to the delicate feelings of those around her.