Well the longest fish I've ever had was a roughly 8" weather loach (man I loved that fish... had him for years), and apart from that my 3" black skirt tetra just succumbed to bloat, so currently my entire fish collection consists of 2 2" black skirt tetras and one (gettin two more next week) 4cm cory.
I used to have two goldfish, one 12" the other 15" respectively.
Started their lives off in a 10, moved to a 20, then to a 40 - and then to a pond, before I sold 'em because i didn't have the room for a bigger pond for them.....