Just tell her you have considered an upgrade. And are prepared to sell the smallest tank ? i teared down the wall between kitchen and tv-room and setup my 1920 liter tank plus 375 liter sump as a divider. Then when the she-devil started to complain that we culdnt eigther sleep or hear the tv cus all filtration and piping noice. I just said to her that she can get the noice gone if i take the biggest room in the basement to build whatever i want because you cant hear it from there? piece of cake? so just build up an unbearable situation with noices and break her down till you get your new tank??Fun for Me but also dangerous when I come home with a pile of wood and a pond liner and my wife asks me what it’s alll for......