Why Do 'Japanese Moss Balls' Float By Day And Sink By Night?

Why do those adorable velvety green “Japanese moss balls” living in your aquarium float during the day and sink at night?

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Health Problems of Marimo Balls: Color Indicators

Please help.. how do I put an end to this devastating algae takeover? : r/aquarium

Marimo Moss Balls - 5 pieces -Chladoflora Aegagropila

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Marimo Moss Ball Problems and Issues Guide

Marimo Moss Ball Problems and Issues Guide

Why Do 'Japanese Moss Balls' Float By Day And Sink By Night?

Marimo Moss Ball Problems and Issues Guide

anyone knows whats inside these floating java moss balls? bought them from petco and im thinking on eventually breaking them apart to make a moss wall but idk how thick the moss

Scientists Have Figured Out Why Marimo Balls Float—But Only During the Day