Mijia Smart Fish Tank 2 Pro: Let AI Take Care of Your Fish

When it comes to fishkeeping, what discourages most beginners isn’t the initial purchase of the fish, but the ongoing maintenance: scheduled feeding, water quality control, and lighting adjustments—not to mention the anxiety of leaving the tank unattended during business trips or vacations. The Mijia Smart Fish Tank series has always focused on lowering the barrier to entry for the hobby. The all-new Mijia Smart Fish Tank 2 Pro goes all out with a larger water capacity, a dry-wet separation filtration system, a physical color display, AI-driven smart strategies, and automatic feeding. It is no longer just a simple desktop display tank, but a comprehensive AI-powered aquatic hardware system that caters to both beginners and advanced hobbyists.

Design and Tank Body: 31L Wide-Body Ultra-Clear Glass with a New Top-Down Viewing Window

The tank measures 505×295×305mm and boasts a large 31L capacity—a 55% increase over the original 20L model. A larger water volume ensures greater water stability, significantly increasing the margin for error for beginners. It utilizes highly transparent ultra-clear glass with a 16:9 widescreen ratio; the glass is crystal clear without the greenish tint often found in standard glass, ensuring true-to-life color rendering for fish and aquatic plants.

The top cover has undergone a major upgrade, featuring a large transparent “skylight.” This addresses the lack of a top-down view common in traditional smart tanks, enabling viewing from the front, sides, and top, thereby enhancing the visual appeal of the aquascape.

A 1.47-inch HD color LCD screen is embedded in the front of the tank—a key interactive element missing from the previous generation. Users can view real-time water temperature, pump settings, lighting modes, and device alerts directly on the tank without needing to pull out their phones. The status is clear at a glance, making it easy even for older users to understand the device information.

Designed for desktop placement, the unit fits perfectly in living rooms, on study desks, or in entryways. Side ventilation structures have been incorporated to mitigate the fogging issues caused by temperature differentials in older models; however, slight misting may still occur in environments with extreme temperature differences—a natural physical phenomenon for glass tanks.

Filtration System: Dry-Wet Separation Rear Filtration, Solving Water Quality Issues in Smart Tanks

Filtration is the heart of a fish tank, and it represents the most significant hardware upgrade in this Pro version. The Mijia Smart Fish Tank 2 Pro features a multi-stage precision filtration system combining dry-wet separation with trickle filtration, a large 3,000mL filter media compartment, and separate chambers for mechanical and biological filtration.

1. The dry-wet separation box allows fish waste and leftover food to quickly drain away from the main water body, reducing secondary pollution caused by debris soaking in the water; this slows water quality deterioration and reduces the frequency of water changes.
2. A U-shaped water flow design extends the contact path between the water and filter media, while dual biological filter cartridges provide ample space for beneficial bacteria colonization, stabilizing the nitrogen cycle and maintaining ecological balance.
3. It is equipped with a quiet, brushless water pump (510L/h, 3 adjustable speeds) and comprehensive sound-dampening insulation; operating noise is below 35dB, ensuring minimal disturbance in office environments. The widened intake grille offers superior waste removal capabilities and resists clogging from fish waste or debris, while a protective plug at the pump connection ensures safety during disassembly and maintenance.

The multifunctional side intake compartment includes a reserved 5W waterproof expansion port, allowing for the direct installation of a heater or UV sterilizer without complex rewiring—offering advanced hobbyists greater flexibility and customization options.

Lighting System: RRGB Aquatic Plant Light + Ambient Spotlight – Balancing Plant Growth and Atmosphere

Lighting goes beyond simple illumination; the system consists of two modules: a main aquatic plant light and an independent spotlight.

• RRGB Dual-Red Aquatic Plant Light: Features a high Color Rendering Index (CRI/Ra > 97) and a 620–680nm red light spectrum. It promotes photosynthesis and growth in aquatic plants while faithfully rendering the natural colors of the fish, making it ideal for aquascaping.
• Independent Ambient Spotlight: Supports 8 preset lighting effects, 16 million colors, and a “flowing light” night mode. It creates a captivating atmosphere for your desktop aquascape even after the main lights are turned off at night.

All lighting supports scheduling and day-night simulation, mimicking natural sunrise and sunset cycles to prevent startling fish and shrimp with sudden, intense light changes and to protect the growth cycles of aquatic plants. ## AI-Powered Experience: Backed by the Mi Home Ecosystem for Automated Fishkeeping

Designed as an AI-driven smart home device, the system focuses on reducing the burden of fishkeeping by integrating automatic feeding, water quality monitoring and alerts, AI-driven operational strategies, and remote control capabilities.

1. Standard Automatic Feeder: Supports both manual and scheduled smart feeding modes, allowing for customized feeding frequency and portion sizes. It automatically executes feeding plans during business trips or short vacations. The Mi Home app sends push notifications for feeding errors or low food levels, preventing issues like hungry fish or water contamination caused by overfeeding.
2. AI-Driven Adaptive Operation: Simply input the tank setup duration, fish species, and fish count into the app, and the system automatically selects the optimal water pump settings and lighting cycles. Beginners avoid the hassle of researching parameters; the system provides a tailored setup plan, significantly reducing the risk of tank failure.
3. Dual Smart Control: Features a 1.47-inch color screen for local operation, while the Mi Home app allows for remote temperature monitoring, feeding, pump adjustment, and lighting control. It supports “Xiao Ai” voice control—enabling users to toggle lights or switch lighting effects with a simple command—and integrates seamlessly into whole-home smart scenarios for automation with other devices.
4. Comprehensive Alerts: Dual alert system—featuring on-screen pop-ups and mobile app notifications—warns users of abnormal water temperatures, equipment malfunctions, or the need to replace consumables, ensuring risks are identified promptly.

Note: The hardware supports temperature monitoring and alerts but does not include probes for measuring water quality parameters such as pH or ammonia/nitrogen levels; maintaining water quality still requires regular water changes and maintenance. ## Hands-on Summary: Pros and Cons

✅ Pros

1. Large 31L water capacity + dry-wet separation filtration; water quality stability is significantly improved over the previous generation, offering greater fault tolerance for beginners;
2. Physical LCD color screen allows for direct, visual interaction, eliminating reliance on a smartphone;
3. Upgraded lighting specifications featuring both aquatic plant lights and ambient spotlights, delivering excellent visual appeal for aquascaping;
4. Comes standard with an automatic feeder, making it ideal for unattended care during business trips; expansion bay supports a heater and UV lamp, catering to both beginners and casual hobbyists;
5. Quiet water pump with excellent noise control, suitable for desktop placement at home; fully integrated into the Mi Home ecosystem, supporting voice control, remote operation, and whole-home automation;
6. Crowdfunding price of 599 RMB is competitive compared to similar smart ecosystem tanks that include automatic feeders.

⚠️ Areas for Improvement

1. Lacks quantitative water quality monitoring (e.g., pH, ammonia/nitrogen levels), offering only temperature monitoring; manual maintenance and water changes are still required;
2. Condensation may still form on the tank walls in environments with significant temperature differences—a physical limitation;
3. The unit is relatively large and heavy, requiring ample desktop space; expansion accessories like the heater and UV lamp must be purchased separately;
4. The automatic feeder is compatible only with pellet food; it cannot handle flake food or bloodworms.

Who Should Buy It?

Recommended for: Users looking for a desktop aquarium, beginners starting out in fishkeeping, frequent travelers, users of the Mi Home smart ecosystem, aquascaping enthusiasts, and those seeking automation to reduce daily maintenance.

Proceed with Caution if: You intend to keep large fish or maintain high stocking densities, expect a fully automated system that requires no water changes, or prefer feeding live food or flakes.

Final Thoughts

The Mi Home Smart Fish Tank 2 Pro transcends the concept of a “glass tank with a light.” It combines mature aquarium technologies—such as dry-wet separation filtration and large-volume ecosystem logic—with AI-driven smart home capabilities. It is no longer merely an ornamental piece, but a compact, automated ecosystem. It doesn’t allow for a completely “hands-off” approach to fishkeeping, but by delegating high-frequency, repetitive tasks—such as feeding, lighting, and pump management—to AI, it genuinely lowers the barrier to entry for the hobby.