<![CDATA[Aquarium maintenance needs constant monitoring of water quality and all its equipment to keep fish and other aquatic life healthy. Manual maintenance is inefficient, since it requires routine checks and control of several parameters at the same time. This study designed a smart aquarium maintenance system to monitor water quality, controls equipment automatically, and draws its power from a renewable energy source. The system used an ESP32 S3 microcontroller as its main controller, integrated with pH, water temperature, turbidity, and ultrasonic sensors. A water pump, a relay module, a servo motor, a Peltier-based cooling module, and a heater worked together to keep the aquarium environment within the desired range. Then a solar power plant charged the battery through an MPPT controller. The Android application, named AquaKeep, was chosen to connect to the hardware through Firebase Realtime Database and lets the user monitor and control the system remotely. Testing showed that the temperature, ultrasonic, and pH sensors reach average errors of 1.13%, 1.98%, and 1.70%, all within the 5% threshold set for this study. The automatic feeding system reached a 100% success rate across eight test scenarios. The cooling system lowered the water temperature by an average of 2.9°C every 10 minutes, and the solar power supply kept the system running for 17 hours without sunlight, exceeding the 12-hour target. These results showed that the developed system works accurately, automatically, and sustainably in keeping the aquarium environment stable.]]>
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