Hello everyone, I'm fairly new to this forum and was hoping someone can help me solve my issue. I recently purchased a new fish tank for my fish, but when I added the air pump and plugged in my airstone (with suction cups to the aquarium wall) this annoying vibrating sound started. I'm worried that the vibrations can stress the fish, and it's also very annoying to listen to it. The pump is elevated higher then the tank, and only makes the sound when the airstone is attached to the wall of the aquarium or touching any part of the aquarium. Why is this and how can I fix it? Thanks in advance.