My first tank was nearly 2 years ago. My wife and I bought a friend a little 15 gallon tank for Christmas, but they changed their mind about keeping fish - so I set up the tank in our house. The local pet shop advised us to get clown loaches, denison barbs and dwarf gouramis as suitable for a 15 gallon
There were a lot of fish deaths in those early months. I still have the little tank in our living room, very stable now with 3 schools of tetras (neons, pristellas & rummy noses).

Things escalated after that, and within 6 months I bought a used 115 gallon bow front complete with a strange mix of malawis, severs, red jewels and a black shark catfish. Today I have it set up as a Malawi tank with mbuna and synodontis. It also sits in our living room, beside my recliner. I spend much less time watching TV now, and more time watching fish.
That fed the addiction, and last month I picked up an old 200 gallon tank, cleaned it up, planted it with live plants, and set it up in the hallway outside our bedroom with 3 blood parrots, a school of giant danios and a school of congo tetras.
That's probably it now, as I don't think I can get any more tanks without getting a divorce first.