Trust me.. its frustrating. It's better to have your own hobbies then to share them. Its pretty annoying having to argue over plant placement... what lights to buy.... (I like bluer light.. I want natural sunlight... blah blah..)
I speak from experience. Its far less irritating to try and justify the purchase of "that fish or plant you just HAD to have" then to fight over which fish or plant you're going to buy.