Originally Posted by Socratic Monologue
Yep, I think screwing down the pump is a good idea, as is using the Mistking clamps (or equivalent) to fasten the tubes. If the rattling is evident at the glass top, perhaps a couple O rings/gaskets to dampen the movement between the glass and the nozzle is in order.
If the sound is coming from the MistKing pump, screwing down the pump and isolating it can help. Placing a rubber gasket between the pump and what you are bolting it down to will isolate vibrations thus lowering sound.
The sound could also be coming from vibration where the MistKing spray head is mounted to the tank. Installing O rings on both sides of spray head where it passes through and into the tank should also help.
Anything that helps isolate and stop vibrations from resonating like a piano sounding board will help.
Sounding boards actually amplify sound.
A sound board, or soundboard, is the surface of a string instrument that the strings vibrate against, usually via some sort of bridge. Pianos, guitars, banjos, and many other stringed instruments incorporate soundboards. The resonant properties of the sound board and the interior of the instrument greatly increase the loudness of the vibrating strings
Every little bit helps.