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Tropical Aquarium

A reef bursting with colour and clever cranks, if you can stomach the price.

Set 10366 · 2025

Pieces4,154

Minifigsn/a

Year2025

Set number10366

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The verdict

If your mate wants a big, bright centrepiece that actually does something on the shelf, this is a lovely one to own.

The colours are gorgeous and the little hand cranks that make a fish swim and a crab pop out are genuinely charming. Just be honest with them about the money, because this is one of the priciest per-piece Icons sets going, and the first two-thirds is all tank and background before the fun starts. Tell them to buy it because they love the look, not because it's a bargain.

Best for: adult builders who want a colourful, interactive display piece and don't flinch at the price

The full review

What it is

So your mate has spotted the Tropical Aquarium (10366) and wants to know if it's worth it. Here's the honest take. This 4,154 piece LEGO® set is an Icons display model of a reef tank, and when it's done it's a real riot of colour. You get four model fish, coral in oranges, purples and pinks, sea worms, sea snails, an oyster with a pearl inside, and little strings of air bubbles rising through the water. The tank itself is a chunky thing at around 52cm wide, 36cm tall and 28cm deep, so this is a centrepiece, not a shelf filler. The best part is that it isn't just a static diorama. Hidden cranks and dials let you animate the whole scene by hand, so you can make a fish glide across the tank, set the coral swaying, coax a crab out of an underwater cave and flip open a little treasure chest. It's the kind of set people actually stop and play with when they visit.

The catch

Now the caveats, because a good friend tells you these before you spend. The price is the elephant in the room. At 479.99 dollars (399.99 pounds) it works out to roughly 11.6c per piece, which is on the expensive side even by Icons standards, and a Brickset buyer poll had 45 percent of people saying it was simply too dear. A lot of that piece count goes into the tank, base and mechanical guts rather than the pretty sea life, and reviewers noticed the first fish and coral don't turn up until nearly two-thirds of the way through the 500-page instruction booklet. So the opening stretch is a slow, repetitive run of frame and background before the payoff arrives. It's a case of bigger not automatically meaning better, and if your mate is chasing value per brick they'll feel that pinch.

Who it's for

Who should grab it? Adult builders who fall for the look and want something colourful and interactive on display will be delighted, especially anyone who loved the Botanicals sets and wants that idea scaled way up. It's also a lovely one for parts collectors thanks to all the recolours. Who should skip it? Anyone on a budget, anyone who finds long structural builds tedious, or anyone who just wants the most model for their money. If your friend loves the reef and can make peace with the sticker, they'll be very happy. If they're hesitating on price alone, that hesitation is completely fair, and it's the kind of set well worth waiting for a discount on.

The parts story

What the build is actually like, and the pieces worth knowing about.

Building this one is a game of two halves. The first stretch is all engineering and patience: you assemble the tank frame, the base and the backdrop, plus the mechanical linkages that drive the interactive functions, and honestly it's a bit of a grind with a lot of repeated structural work before anything looks like a reef. Stick with it, because once the scenery phase kicks in the whole thing comes alive. Placing the coral, plants, fish and the fiddly little details like the oyster and air bubbles is where the set earns its keep, and the manual crank mechanisms are cleverly hidden so you can operate them later without disturbing the display. It's a build that rewards you for not giving up during the slow opening act.

For parts nerds this set is a proper haul. LEGO went recolour crazy here with 21 recoloured elements, so you get coral and plant pieces in oranges, purples and pinks you won't find elsewhere, plus translucent fins in never-before-seen hues that catch the light nicely. There's a brand new thin fin element created specifically because the designers found normal fins looked too big and bricky on the fish, and it doubles up on some of the aquatic plants too. Add in new transparent leaf pieces and a couple of fresh hat colourways and you've got a genuinely useful bag for MOC builders. The part-count value story is the classic Icons tension: 4,154 pieces sounds huge, but a big chunk is tank and structure, so judge it on the colours and new moulds rather than the raw number.

Fun facts

01Designer Sven Franic and element designer Matéo Dupureur pitched it as the Botanicals idea scaled way up, and consumer testing showed fans specifically wanted a fish tank.
02The team invented a brand new thin fin element because the fish fins kept looking too big and bricky with existing parts.
03LEGO Star Wars designer César Soares reportedly advised the team not to put obviously freshwater fish in a saltwater tank, so the species lean more imaginative than strictly accurate.
04The encased anemone centrepiece drew inspiration from the LEGO Disney Pixar Luxo Jr. lamp set.