Location of your tank

Turbo I am guessing your 40 is not like my 90 which sounds like Niagara Falls when the water is passing through the sump.

 

30 gal in the family room, 12 gal cube in wife's office @ work & 12 gal cube in spare bedroom/computer room. Planning in-wall 55 for the dining room.

 

I have my 55 in the bedroom. Noise isnt a problem unless the skimmer is acting up or the turbos are getting friendly with the powerheads ha...though i do miss the water noise since moving to the dorm.

 

I have a small bowfront FW in my bedroom with all the filtrartion in the hood which makes a nice very unnoticable trickling sound, but hey I go to sleep with a white noise machine that is the ocean (obviously a reefer lol) and I am going to have a 55 in my office, I already have an anole (lizard reptile) habitat in there and it is starting to look like the zoo! lol! If I ever become a millionaire, I am going to build a house with a fish tank in every room all tied to a sump in the basement! lo!l!