I listen to my wife when she says no to more tanks.. Two reasons:
1. It's more important to me to have a good relationship than to have more fish tanks.
2. If it were up to me, I'd buy tanks, fish and equipment until I was broke and on the street. She keeps me from going insane with obsessions.
It's not always her though, sometimes I slow down on a hobby because I WANT to spend more time with her, I want to save for a house, I want to be able to walk into a room without bumping into a tank.
Relationships are about compromise..