Hahahahaha!! I'm addicted too!! We should start a support group! Oh, wait, its called your "Local Aquarium Society" hahaha
I started with one 29gal. It was my boyfriends and he neglected it. He had an extra 29gal and a 55gal in the basement already. Then we started picking tanks up off the curb and taking abused ones in from friends, and Craigslist as well (Love that site!!) and now we have about 10 different tanks kicking around ranging from 1gal - 55 gal
but only 3 are running. (For now 

I started with one 29gal. It was my boyfriends and he neglected it. He had an extra 29gal and a 55gal in the basement already. Then we started picking tanks up off the curb and taking abused ones in from friends, and Craigslist as well (Love that site!!) and now we have about 10 different tanks kicking around ranging from 1gal - 55 gal