I live in an apartment but it sounds without water circulating. I barely started hearing the sound of vibration last night. Right now I'm listening to it again but I think it only happens at night because today I didn't hear it in the morning
You have not evaluated the building's water pump? It can make the entire installation vibrate. To avoid this and if this were the problem, at the exit of the pump there should be an anti-vibration bellows. Many times you only hear at night because of the silence.