Hello..I have a similar situation. My 52 gal is in my living room and I wanted it absolutely silent. I have 2 Fluval U4s inside and it is absolutely silent. I mean, I have to check several times watching the water move to confirm it is working. The water is crystal clear, and water paramters are constant. Easy to clean too. So many people were saying that these can be used only as an additional filter but running 2 of them in my tank keeps everything perfect. This is one of the best decisions I have ever made.
Get them Fluval U4s