---
product_id: 355101422
title: "Sea Flex Saltwater Aquarium Kit 123L- Black"
brand: "fluval"
price: "¥243551"
currency: JPY
in_stock: true
reviews_count: 5
category: "Fluval"
url: https://www.desertcart.jp/products/355101422-sea-flex-saltwater-aquarium-kit-123l-black
store_origin: JP
region: Japan
---

# Programmable 24-hour light timer 25000K full spectrum coral-friendly lighting App-controlled Marine 3.0 LED Sea Flex Saltwater Aquarium Kit 123L- Black

**Brand:** fluval
**Price:** ¥243551
**Availability:** ✅ In Stock

## Summary

> 🌊 Dive into brilliance with Fluval Sea Flex – where tech meets tidal beauty!

## Quick Answers

- **What is this?** Sea Flex Saltwater Aquarium Kit 123L- Black by fluval
- **How much does it cost?** ¥243551 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/355101422-sea-flex-saltwater-aquarium-kit-123l-black)

## Best For

- fluval enthusiasts

## Why This Product

- Trusted fluval brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Total Mobile Control:** Seamlessly customize your aquarium’s lighting vibe anytime, anywhere with the FluvalSmart App.
- • **Vibrant Coral Growth:** Harness the power of 25000K color temperature lighting designed to make your corals thrive and pop with color.
- • **All-in-One Starter Kit:** Includes heater, protein skimmer, circulation pump, sea salt, black sand substrate, and more—everything you need to dive into saltwater aquarium mastery.
- • **Dynamic Ambiance Modes:** Choose from 3 pre-set lighting scenes—Sunny Reef, Deep Sea Glo, and Color Boost—to match your mood or showcase your marine life.
- • **Advanced Filtration System:** Dual multi-stage chambers with foam, carbon & biomax filter rings ensure crystal-clear water and a healthy aquatic environment.

## Overview

The Fluval Sea Flex 123L Saltwater Aquarium Kit combines cutting-edge app-controlled Marine 3.0 LED lighting with a powerful dual-chamber filtration system, optimized for vibrant coral growth and easy maintenance. Its sleek curved design and programmable lighting modes make it a standout centerpiece for any modern home or office, perfect for both beginners and seasoned aquarists seeking a premium saltwater experience.

## Description

The Fluval Sea Flex 32.5 US Gal. (123 L) Saltwater Aquarium Kit makes an exciting addition to Fluval's bold curved aquarium series. It comes equipped with a mobile device operated Marine 3.0 LED that offers total control over brilliant custom colors, multiple dynamic effects and a programmable 24-hour light timer. In addition, this all-new Flex includes a built-in filtration system with 2 independent multi-stage chambers for maximum cleaning efficiency room for the Fluval PS1 skimmer, M150 heater and an easy feed door perfect for the Fluval PF2 Feeder. Comes complete with Foam, Carbon & Biomax filter rings..

Review: Beautiful aquarium! Good to beginners! - This is a great product. It is sharp and great quality. The ONLY wish I had was that I had some instruction on how to test the water in the tank to make sure the levels were right for the fish. It made me nervous. Yes, I was more of a novice. So, you should know that it was easy to assemble and the curved sides and lights are gorgeous. I honestly wished I had gone bigger.
Review: 😩😩😩😩😩 - Poor filtration, weak water pump, not powerful enough. I needed to modify the filtration system because it wouldn’t even clear the water murkiness. The water return pump power is so low that it would hardly make a ripple on the surface so I had to buy another pump. I’m giving this aquarium two stars just on looks. 🙁

## Features

- Full spectrum Marine 3.0 LED operates via the FluvalSmart App on your mobile device
- 25000 K color temperature lighting is ideal for growing vibrant corals
- 3 pre-set lighting conditions: sunny reef; deep sea glo; color boost

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0873VL625 |
| Additional Features | App-Controlled Lighting, Ideal Lighting for Corals, and Programmable Light Timer |
| Best Sellers Rank | #10,905 in Pet Supplies ( See Top 100 in Pet Supplies ) #42 in Aquarium Lights |
| Brand | Fluval |
| Brand Name | Fluval |
| Color | Black |
| Customer Reviews | 4.2 out of 5 stars 87 Reviews |
| Included Components | LED lighting system, filter, heater, protein skimmer, circulation pump, sea salt, black sand substrate, ceramic media, and tongs |
| Item Dimensions L x W x H | 82L x 40W x 39H centimeters |
| Item Shape | Rectangular |
| Item Type Name | Fluval Sea Flex Saltwater Aquarium Kit - 123 L (32.5 US gal) - Black |
| Item Weight | 22.11 Kilograms |
| Item weight | 22.11 Kilograms |
| Manufacturer | Fluval |
| Material | Glass |
| Material Type | Glass |
| Model Number | FS400 |
| Product Style | Contemporary |
| Product dimensions | 82L x 40W x 39H centimeters |
| Specific Uses For Product | Indoor |
| Tank Volume | 123 Liters |
| Tank volume | 123 Liters |
| Target Species | Fish |
| UPC | 015561346580 015561149945 |
| Unit Count | 1 Count |
| Vivarium Type | Aquarium |

## Product Details

- **Brand:** Fluval
- **Material:** Glass
- **Product dimensions:** 82L x 40W x 39H centimeters
- **Special features:** App-Controlled Lighting, Ideal Lighting for Corals, and Programmable Light Timer
- **Tank volume:** 123 Liters

## Images

![Sea Flex Saltwater Aquarium Kit 123L- Black - Image 1](https://m.media-amazon.com/images/I/71+m1KyCQ9L.jpg)

## Questions & Answers

**Q: What’s the difference between the salt and fresh water ?**
A: Salt water is much more complex! Fish are a lot more expensive and balancing the water is much more time consuming than freshwater! The a$$ hat above is a jerk!

**Q: How much clearance do you need on top to access filters etc...**
A: lets say the filter sponges are around 8 inch long and lift straight up in the center so lift the lid off and then filter 8 to 12 inches but you could go tighter if your good and not clumsy

**Q: What are the pump specs? and should I upgrade?**
A: Pump Output : 810 L/h (214 US Gal/h)- 120V/60 . remember the filter is set up to operate thru sponge so you realy dont want to speed up. i just had a friend ask and we are working on adding a fluval 307 i may drop down to a 207. Better to add a canister.

**Q: Can you use this aquarium for freshwater or does it have to be saltwater ?**
A: the LED is the saltwater version lighting  so could cause algea issues in fresh. You can buy a replacement Aquasky LED. And yes you can run frest water just dont leave the light on to long you will get algea .

## Customer Reviews

### ⭐⭐⭐⭐⭐ Beautiful aquarium! Good to beginners!
*by P***R on 10 July 2025*

This is a great product. It is sharp and great quality. The ONLY wish I had was that I had some instruction on how to test the water in the tank to make sure the levels were right for the fish. It made me nervous. Yes, I was more of a novice. So, you should know that it was easy to assemble and the curved sides and lights are gorgeous. I honestly wished I had gone bigger.

### ⭐⭐⭐⭐ 😩😩😩😩😩
*by J***K on 23 March 2023*

Poor filtration, weak water pump, not powerful enough. I needed to modify the filtration system because it wouldn’t even clear the water murkiness. The water return pump power is so low that it would hardly make a ripple on the surface so I had to buy another pump. I’m giving this aquarium two stars just on looks. 🙁

### ⭐⭐⭐⭐⭐ Ein Fenster zum Ozean im Wohnzimmer: Design-Meisterwerk mit durchdachter Technik! 🌊
*by D***L on 15 January 2026*

Ein Meerwasseraquarium ist mehr als nur ein Glaskasten – es ist ein lebendes Ökosystem und ein Statement im Raum. Das Fluval Flex Marine 123L hat meine Erwartungen in dieser Hinsicht nicht nur erfüllt, sondern übertroffen. Versand & Verpackung: Bei einem Glaskörper dieser Größe hatte ich zunächst Sorgen wegen des Transports. Doch Entwarnung: Das Aquarium war hervorragend gesichert. Die Verpackung bestand aus einer extrem stabilen Doppelkartonage mit massiven Styropor-Eckschützern. Trotz des beachtlichen Gewichts kam alles ohne einen einzigen Kratzer an. Der Versand erfolgte per Spedition und war innerhalb von drei Werktagen perfekt terminiert – professioneller geht es kaum. Das emotionale Erlebnis – Faszination Meerwasser: Sobald das Licht der Marine-LED zum ersten Mal das Becken flutet, verändert sich die Atmosphäre im Raum. Das gebogene Design der Frontscheibe (das Markenzeichen der Flex-Serie) erzeugt eine optische Tiefe, die einen förmlich in die Unterwasserwelt hineinzieht. Es ist ein unbeschreiblich beruhigendes Gefühl, abends das Licht im Zimmer zu löschen und nur dem sanften Plätschern zu lauschen, während die Korallen unter dem aktinischen Blaulicht fluoreszieren. Es ist wie ein Kurzurlaub am Riff, direkt nach dem Feierabend. Technische Highlights aus Nutzersicht: Die App-Steuerung: Die Integration der Marine 3.0 LED über die FluvalSmart App ist genial. Den Sonnenauf- und -untergang exakt zu programmieren, ist nicht nur Spielerei, sondern Stressprävention für die Bewohner. Das Filtersystem: Das versteckte Technikabteil im hinteren Bereich ist ein Segen für die Optik. Keine störenden Kabel oder Pumpen im Sichtbereich – alles verschwindet elegant hinter der Waben-Optik. Leistungsstarke Strömung: Die zwei Auslassdüsen lassen sich präzise ausrichten, was für die Sauerstoffanreicherung und die Korallenpflege essenziell ist. Ein kleiner Hinweis: Das Becken ist komplett, aber für ein vollwertiges Riff-Setup sollte man – je nach Besatz – langfristig über den passenden Fluval PS1 Eiweißabschäumer nachdenken, der perfekt in das hintere Fach passt. Fazit: Das Fluval Flex 123L ist der perfekte Einstieg (oder das perfekte Upgrade) in die Meerwasseraquaristik. Es verbindet modernstes Design mit einer Funktionalität, die es auch Einsteigern leicht macht, erfolgreich zu starten. Wer ein stilvolles, leistungsstarkes Komplettset sucht, wird hier fündig.

## Frequently Bought Together

- Fluval Flex 32.5 Marine Salt Water Aquarium Kit - Fish Tank for Fish, Coral & More - Comes with LED Lights, Filtration System & More - 32.5" x 15.75" x 15.35" - 123 L, 32.5 Gal. - Black
- Fluval Sea PS1 Protein Skimmer for Aquarium, for All Breed Sizes
- Fluval M 150-Watt Submersible Aquarium Heater – Reliable, Compact Heating with Mirror Technology for Fresh & Saltwater Tanks Up to 45 Gallons

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*Product available on Desertcart Japan*
*Store origin: JP*
*Last updated: 2026-02-10*