Review on Enhance Fish Tank Oxygenation with Mylivell Quietest Aquarium USB Air Pump: Ultra Silent, High Energy Saving, Complete with Air Stone and Silicone Tube by Adrienne Holmes

This pump is very quiet. Sometimes you realize that our air conditioner is more than a pump. I paired it with an angled sponge filter and a small regular aerosol stone (not the big round one that came with the pump) and installed it in a 5 gallon tank. About two and a half months after installation, it started making strange noises. It was a continuous clicking sound, almost like that of a dolphin. However, it never stopped working, it just got noisy. I hadn't been in touch with Revain's return policy for a long time so I contacted Mylivell customer service for advice and they immediately offered to send me a replacement. Sometimes you get a defective product, everyone happens at some point, but given the situation I think I would buy from this company again just based on the customer service response.