Marimo ball owners: have you ever noticed your ball sometimes afloat and other times not? - 1) ball

Marimo ball owners: have you ever noticed your ball sometimes afloat and other times not?
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1) ball is resting at the bottom right now (8:30am).
2) ball was floating last night around midnight.
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What could cause this change in buoyancy? Is it metabolic activity differences between night and day? I haven’t touched or disturbed the water in the past 2 weeks and I’m certain I’ve noticed it both floating and sinking. One thing is for sure: this calls for a time lapse! ⌚ = observe-for-long-time-with-camera
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