# Do Fish Sleep? What Happens in Your Freshwater Aquarium at Night (Lighting, Oxygen & Behaviour)

Page: https://stenobird.com/podcast/the-aquarist-s-edge-7046041/do-fish-sleep-what-happens-in-your-freshwater-aquarium-at-night-lighting-oxygen-behaviour
Text version: https://stenobird.com/podcast/the-aquarist-s-edge-7046041/do-fish-sleep-what-happens-in-your-freshwater-aquarium-at-night-lighting-oxygen-behaviour.md
Podcast: [The Aquarist's Edge](https://stenobird.com/podcast/the-aquarist-s-edge-7046041)
Published: 2025-12-31T12:33:01+00:00
Episode link: https://www.spreaker.com/episode/do-fish-sleep-what-happens-in-your-freshwater-aquarium-at-night-lighting-oxygen-behaviour--69259486
Audio file: https://api.spreaker.com/download/episode/69259486/s2ep56_do_fish_sleep_what_happens_in_your_freshwater_aquarium_at_night_lighting_oxygen_behaviour_9i928.mp3
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Duration seconds: 1076

## Resource

This episode explores what your freshwater aquarium is really doing while you sleep. From plant respiration and fish “sleep” behaviour to oxygen levels and filter bacteria, learn more about the hidden night shift inside your tank. Learn how to create gentle lighting transitions, set up smart night-time aeration, and design an aquascape that keeps your fish calm after dark. Two troubleshooting segments tackle common night-time problems: fish panicking when lights turn on or off, and oxygen dips that leave fish gasping at the surface. This episode is perfect for beginner and intermediate freshwater keepers who want to understand their tanks as 24-hour ecosystems, not just daytime displays. 🎵 Music: "Auld Lang Syne (Acoustic version)" - Loving Caliber (Epidemic Sound - https://www.epidemicsound.com/music/tracks/c8c90bf6-af03-48c8-bc87-6f2e5d38b5cf/ )

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## Transcript

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