It's been some time since I picked up an Engineering textbook so this is the lay-man's version of what might be a reason for the incredibly loud air-pump.colton it doesn't just rattle it starts running i had to tie it down to the pillar so it wouldn't fall into the water.. i gotta get some of those real big heavy air stones.. the ones i have now jus get pushed up to the surface with all the pressure.. will check it out at the lfs mate.. cheers..
Potential Cause: Output of the pump is X liters/hr... Capacity of the tube and/or Capacity of the air-stone to allow air through is less than X liter/hr.. hence, the pump is working a lot harder to push air through.
Potential Solution: Use a larger bore pipe for the air pump and attach to an outlet which can allow air to pass at equal or greater capacity as that of the air pump
Also, AWESOME build