Unocho Aquarium Rocks Natural Seiryu Stone 20LB Aquascaping Rocks for Fish Tank, Aquarium Landscaping & Decoration, Miniature Models & Fairy Garden (3–10 Inches)
$48.00
Price: $48.00
(as of Oct 08, 2025 10:45:26 UTC – Details)
Product description
Seiryu Rock Stone – Premium Aquarium Rocks for Stunning Aquascapes
Naturally Formed • Environmentally Safe • One-of-a-Kind
Upgrade your tank with Seiryu Rock Stone, the ultimate choice for aquarium rocks aquascaping. Perfect as fish tank decor or centerpiece aquarium stone in your aquascape.
Key Features 
Natural Formation
Formed over thousands of years, each Seiryu Stone has unique textures and shapes – ideal for aquascaping rocks and rocks for aquarium
Excellent Physical Properties
High hardness, density, and abrasion resistance make it one of the most durable aquarium rocks and hardscape stones.
Easy to Shape
Stack or combine fish tank rocks to create mountains, waterfalls, or riverbeds – perfect for aquarium rocks for fish tank.
Environmentally Safe
Non-toxic and safe aquarium decor for fish, shrimp, plants, and reptiles
Multi-Scene Display 
Strong Plant Adhesion
The ridged surface of aquarium stones provides excellent grip for moss and aquatic plants.
Versatile Use
Suitable for freshwater aquarium rocks, saltwater aquariums, terrarium stones, and miniature gardens.
Multi-Scene Display
Freshwater Tank + Saltwater Tank + Shrimp Tank + Terrarium
From freshwater aquarium rocks to dragonstone aquarium rock setups in shrimp tanks or terrariums, Seiryu Stone for Aquarium adapts to any environment.
Its natural rocks with white veining make it perfect for rocks for fish tank and aquascaping rocks. Stack for dramatic cliffs or scatter to simulate riverbeds – endless possibilities for your aquarium decor.
Recommended Usage Scenarios:
Freshwater AquariumsTropical Fish TanksSaltwater AquariumsMiniature Aquascape TankShrimp TanksTurtle TanksAmphibianTerrariums
Choose the Perfect Size Seiryu Rock for Your Aquascape
Size: 11LB (3–8 inches) – Ideal for nano tanks, shrimp tanks, and small aquascaping rocks layouts. Compact aquarium rocks perfect for detailed fish tank decor.Size: 20LB (3–10 inches) – Great for medium-size aquariums (10–30 gallons). Balanced mix of aquarium stones and fish tank rocks.Size: 40LB (3–12 inches) – For large aquariums (30 gallons+), terrariums, or professional aquarium rock aquascaping. Includes impressive large aquarium rocks to create dramatic focal points.
Will Seiryu Rock change the water quality?
Seiryu Rock is a natural stone, free of harmful substances and safe for fish and shrimp. It generally does not affect water quality, though in some cases it may slightly increase water hardness.
Will the shape and size of the stones be exactly the same as the pictures?
Each Seiryu Rock is naturally formed, with unique shapes and textures. We ship according to the selected weight and size range, but they will not be identical to the pictures—this is the charm of natural stones.
What aquascaping styles can be created with Seiryu Rock?
Known for its natural textures and varied shapes, Seiryu Rock is perfect for creating mountain ranges, canyons, caves, or stream-style aquascapes. Whether minimalist or dramatic layouts, it brings a distinctive beauty.
Do Seiryu Stones need cleaning?
They’re pre-washed for convenience, and some light dust may appear during transportation. Simply give them a quick rinse with clean water before adding to your tank.
Can Seiryu Rocks be used with plants or moss?
Absolutely. The textures and crevices of Seiryu Rock make it ideal for anchoring aquatic plants, moss, or small greenery, creating a more natural and lush aquascape.
Package Dimensions : 12.09 x 10.2 x 6.38 inches; 19.91 Pounds
Item model number : 1
Date First Available : May 6, 2023
Manufacturer : Unocho
ASIN : B0CBPGY3CV
Best Sellers Rank: #21,817 in Pet Supplies (See Top 100 in Pet Supplies) #9 in Aquarium Décor Rocks
Customer Reviews: 4.5 4.5 out of 5 stars 290 ratings var dpAcrHasRegisteredArcLinkClickAction; P.when(‘A’, ‘ready’).execute(function(A) { if (dpAcrHasRegisteredArcLinkClickAction !== true) { dpAcrHasRegisteredArcLinkClickAction = true; A.declarative( ‘acrLink-click-metrics’, ‘click’, { “allowLinkDefault”: true }, function (event) { if (window.ue) { ue.count(“acrLinkClickCount”, (ue.count(“acrLinkClickCount”) || 0) + 1); } } ); } }); P.when(‘A’, ‘cf’).execute(function(A) { A.declarative(‘acrStarsLink-click-metrics’, ‘click’, { “allowLinkDefault” : true }, function(event){ if(window.ue) { ue.count(“acrStarsLinkWithPopoverClickCount”, (ue.count(“acrStarsLinkWithPopoverClickCount”) || 0) + 1); } }); });
⛰Naturally Formed & One-of-a-Kind:Seiryu Rock Stone is a naturally formed aquarium stone that has been shaped over thousands of years. Its sharp edges, peaks, embedded voids, and gray and irregular white patterns make each piece unique. It is the perfect choice for aquarium rocks and fish tank decor, adding a distinctive aesthetic to your aquatic environment
⛰Realistic Natural Scenery:As a top choice among aquascaping rocks, Seiryu Stone replicates majestic mountain scenery. Its varied shapes and rugged textures provide an immersive aquascape experience. Whether used as tank rock, aquarium caves, or combined with aquarium wood, it adds depth and authenticity to underwater landscapes.
⛰Versatile Application: Ideal for creating aquarium decoration rocks and fish tank decorations, evoking a natural and serene ambiance. Aquarium rocks aquascaping making it a top option for freshwater tanks and river-themed aquariums.
⛰Stackable & Flexible Layout:Seiryu Stone can be stacked to form dramatic rock formations or scattered to simulate natural riverbeds, enhancing your aquascape rocks design. Its high hardness and durability make it suitable for aquariums, terrariums, garden rocks, and other landscaping applications.
⛰Safe for Fish & Plants: With a stunning natural look and zero harmful substances, this stone is non-radioactive and completely safe for fish, shrimp, and aquatic plants—even sensitive species like bettas. Perfect for aquarium décor, betta tank accessories, and fish tank gravel.
⛰Endless Creative Possibilities:Each Seiryu Stone is unique, offering limitless options for aquarium decor rocks, fish tank rock layouts, miniature aquascapes, and even artistic uses such as sculptures or murals. Its excellent physical properties and natural beauty make it a must-have for both hobbyists and professional aquascapers.
Customers say
Customers find these aquarium rocks visually appealing and appreciate their variety, with one mentioning they come in different shapes and sizes. The stones receive positive feedback for their coloration and functionality, with one customer noting they work well in their tank. Customers also like their size, with one mentioning they’re perfect for an 18-gallon cube, and consider them good value for money.
13 reviews for Unocho Aquarium Rocks Natural Seiryu Stone 20LB Aquascaping Rocks for Fish Tank, Aquarium Landscaping & Decoration, Miniature Models & Fairy Garden (3–10 Inches)
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$48.00
Arnaldo Andres Araque Mendez –
Excelente producto!
Pensé que iba a ser poca la cantidad de piedras Pero para mà asombro fue bastante por lo cual lo recomiendo comprar, además traÃan diferentes tamaños y formas lo cual hizo que fuera bastante creativo en la creación de mi acuario. Recomendado 100%>
David Willyoung –
Aquarium rocks!
Very nice rocks! Im very pleased!
Amazon Customer –
A+ purchase
I looked at a few seiryu stone vendors on here and picked these cause it seemed like the best balance of size, quality, and value. I am very pleased with my purchase.They’re fantastic. I have them half and half with some seiryu stones that I handpicked and bought in person at a dedicated retailer. I honestly think I like these even more than the ones I personally picked out. Great variety of sizes, and a ton of interesting texture.
Jason Roberts –
Great stones, good value!
I was a bit dubious what I was going to get but I was pleasantly surprised. Considering what you pay at an aqua scaping store, it’s a good value. I received a good selection, two large rocks, several medium, and a few small. My guess is they have someone curating the selections for size and aesthetic. Would buy again.
Stephanie K –
They rock!!!
Solid aquarium rocks! The only reason I didnât give 5 stars is that some of the rocks included were WAY smaller than advertised in the specifics. However, they did include a few extra of the smaller ones. I didnât look like any broke in transit and I was satisfied with receiving extra smaller rocks to make up the difference, but not every buyer might be okay with that. Otherwise, really nice quality and arrived quickly. A bug positive for me was the coloration of the rocks, a few of them had some variation in cut too, so it makes for a really cool looking tank set up. Definitely recommend and will be purchasing again myself!
William Rojas –
Awesome look!
greats rocks love them still have couple left for another tank i want to set up
Amazon Customer –
Allot smaller than described
It says 3-8â, the largest is 4â and the others are smaller. A few of rocks broke in transit.
Wyatt Peterson –
Good rocks!
Good rocks! Very good selection!
Nadine –
Ich habe mir mit den Unocho Seiryu Rocks eine schöne Landschaft für mein Cichliden-Aquarium gebaut. Die Steine sind von guter Qualität und bieten eine schöne Auswahl an Formen und GröÃen, die sich gut kombinieren lassen.Die Steine sollten vor dem Einsetzen gereinigt werden, was aber schnell erledigt ist. Danach sehen sie super aus und eignen sich bestens als natürliche Struktur für meine Fische.Fazit: Empfehlenswerte Steine für Aquarienbauer, die Wert auf Optik und Qualität legen.
bleu–ocean –
Très belles pierres sombre et très véné, tailles et formes variées.
mynameiskate –
Got the 20lb box and was pleasantly surprised at the size and variety of rocks. They were packed fairly well. Dusty… as you would expect. We just unpacked them in the backyard and rinsed them off well. We used some in the tank on their own and then epoxyed some together to make the arch. We used all but two of them, though I think I may add one more in the back to fill it out. We have a 36 gal bow front tank; the 20lb was the perfect size to get. I really like the look of them – lots of interesting detail and faces, lots of options for placement in the tank.
Jason Harley –
Good amount of stone in different varieties of size havenât used them yet waiting for the right time but will look so good to my next build and good money for value and just clean them up before using them so that they donât make the water cloudy
loli –
Excepcional, tiene un precio más elevado que otros similares, pero la composición de rocas es perfecta, de nota que están elegidas para armar una buena composición, no es un batiburrillo de piedras y ya. En mi caso 5Kg para acuario de 70L son perfectas (sumándoles un maponi mediano y alguna raiz más).