LEGO Icons 10366 Tropical Aquarium Officially Revealed | November 2025

The LEGO Icons theme is recreating a vibrant underwater world next month with one of the most visually striking display-worthy models of the year: 10366 Tropical Aquarium. Following the success of recent licensed LEGO Icons sets such as 10365 Captain Jack Sparrow's Pirate Ship and the rumoured 10356 Star Trek: USS Enterprise D, the LEGO Group is turning its attention from the stars and seas to the underwater world in a non-licensed format.

10366 Tropical Aquarium is the latest 18+ release of 2025 and one of the biggest yet. In fact, once 10366 releases on the 13th of November 2025, it will be easily the largest and most expensive LEGO Icons set of the year, retailing for $479.99 / €449.99 / £399.99 with a total of 4,154 pieces included. The underwater build will also be available alongside an exclusive GWP of 5009823 Fish Tank Filter & Fish Food until the 19th of November 2025.

This isn't the first time LEGO has experimented with aquatic displays. The last major fish tank-style build appeared in 2021 with 31122 Fish Tank from the LEGO Creator 3-in-1 theme. With just 352 pieces, the small aquarium included five colourful fish, a mini submarine, coral, and a few plants, primarily aimed at younger builders and designed as a playset.

In contrast, 10366 Tropical Aquarium has been designed as a premium, adult-targeted reinterpretation of the idea, literally replacing an actual fish tank with a brick-built, display-worthy version. Altogether, the set's over 4,000 pieces create an incredible model measuring over 14 inches (36 cm) high, 20.5 inches (52 cm) wide and 11 inches (28 cm) deep.

10366 Tropical Aquarium is a visually rich diorama that faithfully recreates an actual fish tank. The large rectangular aquarium is encased in a sleek black frame, very similar to 31122 Fish Tank but on a larger scale, resulting in a more sturdy build. And just like the LEGO Creator 3-in-1 model from four years ago, the 2025 18+ version includes no glass pannelling, with just the back wall being filled in.

That background wall features an intricate pattern of curved blue tiles that create the illusion of rippling water. A couple of transparent elements can also be found here, representing bubbles. The base of the aquarium mimics a sandy ocean floor, utilising tan and nougat tones with a combination of sloped elements to create this realistic sandy and rocky texture.

The centre of the build is taken up by a huge rock formation coloured grey and nougat, with a whole underwater ecosystem flowing from it. Here we can find a variety of brick-built plants and coral, sea worms and an oyster shell containing a pearl. Some LEGO sea snails can also be found amongst all of this diverse and colourful sea life, which includes magenta and lavender sea anemone, orange branching coral sections which sway in the sea via a grey knob, a purple sponge-like structure and a small yellow coral orb.

Amongst all the coral builds, flowing leaves and various plants, we can find a total of four tropical fish, each displayed and attached to the build in various ways. The four colour brick-built fish include a white-orange fish with yellow accents, a dark red fish with white and orange stripes, a purple fish with shades of yellow and a light blue-yellow fish. The LEGO designers have created a brand new fin element for the fish, which can also be animated as if they are swimming by rotating a side crank.

Final details of the 18+ model include a brick-built treasure chest located at the rear of the build. The entirely brown chest with hints of grey can be opened to reveal some golden LEGO treasure. The Tropical Aquarium also includes another sea creature, a sea crab, emerging from the centre rock/cave. A 'stone' element can be turned to make the crab emerge out of the cave into the rest of the incredibly colourful and stunning 18+ set.

10366 Tropical Aquarium

Set Name - Tropical Aquarium

Set Number - 10366

Age Range - 18+

Piece Count - 4,154

Price - $479.99 / €449.99 / £399.99

Release Date - 13th November 2025

10366 Tropical Aquarium releases on the 13th of November 2025, but what do you think? Will you be purchasing 10366 in a months time? What element of this entirely brick-built LEGO Aquarium are you looking forward to building the most? What would you like to see from the LEGO Icons theme in 2026 and beyond? Let us know your thoughts and opinions in the comments below.