Classroom Noise Monitor🐟 Calm Aquarium 🐟
When the class is quiet, fish swim in one by one and the tank comes to life. When it gets too loud, the fish dart into hiding! If it stays loud, the water clouds over and they get even shyer.
Class goal: Fill the tank with all nine fish before the lesson ends!
Your browser will ask permission to use the microphone.
Sound stays on this computer. Nothing is recorded or sent anywhere.
How Calm Aquarium works
1. Switch on the tank light
Choose a lesson length, press Start the Aquarium, and allow the microphone. The monitor listens for a moment to learn how your room sounds when it is calm.
2. Quiet brings the fish in
While the room stays calm, nine fish swim into the tank one by one and settle in among the plants: angelfish, bettas, neon tetras and more.
3. Noise sends them hiding
Too much chatter startles the fish and they dart behind the plants and rocks, only swimming back out once it is calm. Tip: challenge the class to fill the tank before the bell, and let students guess which fish will swim in next.
Seen in real classrooms
Teachers like you have been sharing how they use the monitor with their classes. Thank you for spreading the word! 💛
Posted a video of your own? Send us the link and we'll add it here.
Explore more themes
Traffic Lights
FREEThe classic traffic light noise monitor, full screen! The light stays green and little cars cruise across town while the class is quiet. Too loud turns it red and jams the traffic.
Quiet Jungle
FREEKeep your class quiet and watch a jungle grow full screen! Trees grow when the classroom is calm and wilt when it gets too loud.
Dino Valley
FREEKeep your class quiet and hatch baby dinosaurs from their eggs! Too much noise wakes the volcano and scares the dinos back into their shells.
Hush Safari
FREEKeep your class quiet and shy safari animals come out of hiding one by one! Too much noise stirs up a dust storm and sends them running away.
Focus Mode
FREEA calm, minimal noise level meter with no cartoons: a breathing light grows with silence and pauses when the room gets loud. Made for older students, exams, libraries and study halls.
Bouncy Balls
FREEThe classic bouncy balls noise meter, flipped to reward calm! Colorful playground balls bounce while your class stays quiet. Too much noise stops the fun and deflates them.
Turkey Tail
PROKeep your class quiet and help a proud turkey fan out all nine tail feathers! Too much noise spooks the turkey into hiding behind the hay. Perfect for November.
Pie Bakery
PROKeep your class quiet and bake nine Thanksgiving pies, from pumpkin to pecan! The oven stops and the crusts start to burn when the classroom gets too loud.
Thankful Tree
PROKeep your class quiet and grow a thankful tree, one gratitude leaf at a time! Too much noise brings a wind that shakes the branches and blows the leaves away.
Christmas Lights
PROKeep your class quiet and Santa's sleigh lights up a snowy street, house by house! Too much noise sends Santa and his reindeer into hiding, and the Christmas lights start going out.
Christmas Eve
PRO'Twas the night before Christmas, and not a creature was stirring! Keep your class quiet and Santa sneaks in to leave nine presents under the tree. Too much noise sends him back up the chimney.
Penguin Colony
PROKeep your class quiet and nine penguins leap out of the icy sea onto the ice, one by one! Too much noise sends them belly-sliding back into the water.
Pumpkin Patch
PROKeep your class quiet and grow nine pumpkins into glowing jack-o'-lanterns! The autumn wind blows the candles out when the classroom gets too loud. Perfect for October.
Butterfly Garden
PROKeep your class quiet and raise nine butterflies from egg to wing! Caterpillars munch, chrysalises ripen and butterflies emerge while the room stays calm: a living life-cycle lesson.
Robot Factory
PROKeep your class quiet and assemble nine little robots on a factory line! The machines pause and amber beacons spin when the room gets loud. Finished robots are never lost.
Ant Colony
PROKeep your class quiet and help busy ants dig an underground colony, chamber by chamber! The digging stops and the tunnels crumble when it gets too loud.
Snail Race
PROKeep your class quiet and cheer nine snails along the garden racetrack! The snails hide in their shells when the classroom gets too loud. Slow and steady wins.
Pirate Treasure
PROKeep your class quiet and fill a pirate chest with treasure! The ship sails toward the island while the room stays calm, and a storm brews when it gets too loud.
Coral Reef
PROKeep your class quiet and watch a coral reef bloom full screen! Corals grow and fish arrive when the classroom is calm, and the reef bleaches when it gets too loud.
Train Journey
PROKeep your class quiet and ride a steam train across the countryside, station by station! The signal turns red and the train stops when it gets too loud.
Space Launch
PROKeep your class quiet to build, fuel and launch rockets to every planet! The countdown holds when the classroom gets too loud.
Wizard School
PROKeep your class quiet and brew nine glowing magic potions in a wizard classroom! The cauldron fizzles and the magic drains away when it gets too loud.
Fairy Village
PROKeep your class quiet and light up a fairy village of mushroom houses! Glowing windows and fireflies fill the glade, until the wind blows the lights out.
Castle Builders
PROKeep your class quiet and build a castle stone by stone! The builders stop and the scaffolding shakes when the classroom gets too loud.
Winter Aurora
PROKeep your class quiet to build a snowman and make the northern lights bloom! Too much noise kicks up a blizzard that blows the snow away.
Balloon Journey
PROKeep your class quiet and ride a hot air balloon from the fields to the stars! The balloon sinks when the classroom gets too loud.
Sleepy Ghost House
PROKeep your class quiet and tuck nine friendly ghosts into bed in a moonlit haunted house! The ghosts wake up and float away when the classroom gets too loud.
Moonlit Bats
PROKeep your class quiet and guide nine bats home across the full moon to their cave! Noise startles the bats and sends them fluttering back out into the night.
Or head back to the classroom noise monitor homepage for the full overview and FAQ.
Calm Aquarium questions
Is Calm Aquarium free to use?
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Yes. Calm Aquarium is one of the seven themes included in the Free plan, with sessions of up to 30 minutes and no account required. Lifetime Pro (a one-time $20 payment) adds the other twenty-two themes and unlimited session time.
Can the class lose progress in Calm Aquarium?
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Yes, sustained noise has consequences here. If the room stays loud for too long the water clouds over and the fish retreat into hiding, so students have a real reason to settle down quickly. A few seconds of calm stops the damage.
What age group is Calm Aquarium best for?
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Calm Aquarium works from preschool all the way to middle school. Young kids love watching the fish arrive, and the realistic, gentle tank suits older classes that find cartoon themes too babyish.
The Calm Aquarium scene isn't reacting to sound. What should I check?
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Your computer is probably listening to the wrong microphone. Interactive whiteboards often take over as the default mic when they're connected. During a session, open the settings (the tune icon in the top right) and pick your computer's built-in microphone. The choice is remembered for future sessions.