not sure which one counts as first.
my gf's cousin stayed with us for a few months. he brought a 10g with one zebra danio in it. i sat and watched that fish be bored and lonely for almost a week. i couldnt take it anymore, so i grabbed the cousin and said lets go to the store. i told him to pick some goddamn fish for the tank. while we were there, i saw an arrowana. bought a tank, set it up, and a week later bought the arro. (didnt know about cycling). i still have that fish today.
so, i dont know which is first. his that i paid for, or draco the arro.
the scary part is, draco survived, and i bought him at about 3" with absolutely no fish experience. yay me.