Official LEGO® image · © LEGO Group and/or the respective rights holders. Source: LEGO Italy ↗

Icons · SET 10366

Tropical Aquarium

A display aquarium built from fish, plants and mechanisms. Controls hidden in the base turn a still scene into a small animated world.

Pieces: 4,154
Release year: 2025
Theme: Icons
Set number: 10366
LEGO recommended age: 18+
LEGO retail price · Italy: 449.99 €

View on LEGO Italy Official building instructions

Available at LEGO Italy when checked on 22 October 2026. Availability can change. Check the store for the latest information.

Retail price reported by the LEGO source for the stated market. Check the store for current price and availability; this does not establish the launch price. LEGO ↗ · Reference checked on 22 October 2026

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Official English name verified at: LEGO English catalogue ↗ · Checked on 24 October 2026.

TIME TO BUILD

How long does it take to build Tropical Aquarium?

Active building time · one person

A starting point for planning your build. Times for each experience level are editorial estimates, not measurements submitted by HowLongToBuild users.

Editorial estimate informed by external reports

Beginner

≈ 25 hSuggested range17 h 30 min – 35 h

Intermediate

≈ 17 hSuggested range12 h – 23 h 45 min

Experienced

≈ 12 hSuggested range8 h 30 min – 16 h 45 min

Based on one person building the set for the first time, following the original instructions and using numbered bags where supplied. Includes normal piece-finding and minor adjustments; excludes long breaks, filming, dismantling and modifications. Sources may use different methods. This range is neither a statistical interval nor a limit: your build may take less or more time.

How we estimate times · sources and method

A mechanical base and many small subjects produce different building rhythms. Two individual reviews estimate about twelve hours and thirteen to fourteen hours respectively. The three experience bands are cautious editorial assessments, not measured averages.

Sources do not always specify the builder’s experience. The three experience bands are our editorial assessment, based on the complexity of the set and individual accounts where available.

Brickset · Tropical Aquarium ↗
The author estimates about twelve hours over three days, without claiming a stopwatch measurement.
Jay’s Brick Blog · Tropical Aquarium ↗
The reviewer estimates about thirteen to fourteen hours in total. This too is an individual assessment.

Checked: 22 October 2026 · Method v1.0 · Limited reports; not a statistical average.

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BEYOND THE BRICKS

Did you know?

The model, the history, the ideas

Inside the set

Movement from the cranks

Controls animate a fish, coral, crab and treasure chest. Hidden connections beneath the scene are part of the build.

LEGO source

A pearl among the details

Alongside four fish are a shell with a pearl, marine worms, snails and bubbles. The scene extends down to the seabed.

LEGO source

Beyond the set

The stories, places and inventions behind your build.

Coral is an animal

Many corals are colonies of small polyps that build a calcium-carbonate skeleton. Their branching appearance can make them look like plants.

NOAA

An alliance within the tissues

Many corals host microscopic algae that use light for photosynthesis. This partnership supports reef growth; expelling the algae can lead to bleaching.

NOAA

Written by HowLongToBuild · Sources are linked with each story · Checked on 22 October 2026. Historical facts and story details refer to the context described.

THE COMMUNITY’S EXPERIENCE

What was it like to build?

Three separate scores from 1 to 10. For difficulty, 1 means very easy and 10 means very difficult.

No approved ratings yet. Scores are never generated by this site or inferred from the recommended age.

Building tips from the community

Specific steps, useful checks and sticking points. Contributions appear after moderation, in their original language. Do not upload instruction pages or personal contact details.

No approved tips yet.

SET THE MOOD

A soundtrack for your build

· Selected for the building rhythm

Electronic sounds and musical patterns suit mechanisms, modules and technological worlds. A pairing for watching a complex structure grow one element at a time.

OUR PICK

Rachel's Song

Vangelis · Blade Runner (Original Score from the Motion Picture)

Electronics, modules and structures

Spotify ↗Apple Music ↗

Choose a different soundtrack

A build to spread over several sessions: choose the more understated option when you want the instructions to take centre stage. The music does not set your pace.

Editorial suggestions, not official soundtracks for the set. External services may require an account or subscription; editions and availability can vary by country. Suggest another soundtrack →

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