Phew, for a second there I was afraid you were going to admit to having some 'odd' feelings about fish that might force someone to report you to the authorities 
Seriously though, I get this from people at the office all the time.
I find people get more into it if you have some funny stories to tell since people always have stupid dog/silly cat tales of their own - I've got some great tales about a Chocolate cichlid I managed to resuscitate by dunking it like a teabag and another about one of my birds almost getting eaten by one of my huge Oscars or the time one of the Oscars bit onto my GFs finger while she was feeding them and she pulled him out of the tanks screaming her lungs out but then went straight into a panic trying to save the fish.
I've got mountains of books and like 2000 dvds so people who know me aren't really surprised by the ridiculous amounts of time and money I put into things.
Seriously though, I get this from people at the office all the time.
I find people get more into it if you have some funny stories to tell since people always have stupid dog/silly cat tales of their own - I've got some great tales about a Chocolate cichlid I managed to resuscitate by dunking it like a teabag and another about one of my birds almost getting eaten by one of my huge Oscars or the time one of the Oscars bit onto my GFs finger while she was feeding them and she pulled him out of the tanks screaming her lungs out but then went straight into a panic trying to save the fish.
I've got mountains of books and like 2000 dvds so people who know me aren't really surprised by the ridiculous amounts of time and money I put into things.