Users may feel that the suction is too weak to effectively clean debris and waste from the aquarium bottom. Ensure the hose is not kinked or blocked, which can affect water flow. Try raising the water level in the tank to increase pressure and improve suction. Also, check if the device is assembled correctly and if the filter is clogged. Users may find the device hard to start or feel that it's complicated to use. Ensure the cleaner is assembled correctly and that the water level in the tank is high enough for the siphoning to begin. Encourage users to follow the instructions step by step. The fast water flow may disturb the fish or stir up sediment at the bottom, affecting the tank environment. Advise users to adjust the cleaning position to avoid getting too close to the fish. If possible, suggest using a cleaner with adjustable flow or attaching a mesh filter to the nozzle to reduce water speed. Cleaning may stir up sediment at the bottom, causing temporary cloudiness in the water. This is usually temporary. Recommend that users turn off the filtration system before cleaning and perform a partial water change afterward. Cleaning in stages can also prevent excessive sediment disturbance. Users may feel that the cleaning process takes too long and isn’t efficient. Advice users to clean regularly to avoid the buildup of debris and waste. The SainSmart XpertMatic Fish Tank Cleaner has different power options, suggest adjusting the settings based on tank size and dirt level. Buy More XpertMatic New Products from SainSmart 25W 475 GPH Aquarium Filter UV Sterilizer (Coming Soon) 5W Aquarium Clean Light What's this for A powerful aquarium filter helps you to clean your tank effectively. What's this for Improves water quality and provides a clear and transparent viewing environment. What's this for Improves water quality and provides a clear and transparent viewing environment. What's in the box Aquarium Internal Filter (Carbon excluded)*1, Airline Tubing*1, Nozzle*1 What's in the box UV-C Light *1, 13mm adapter *1, 16mm adapter *1, Brackets *2, Screws *4 What's in the box Controller*1, Detachable Joint*1, UV Lamp Tube*1, etc