I have kept fish for a long time..
Granted, there are alot of predatory fish that will rip things to shreds, like wolf fish.. But I find them kind of boring, just like most of the larger pure predators.. (P's, Payara, wolfs)
After all these years, I narrowed down my 'Single Fish per Tank' collection to 2 fish and 2 tanks.. Each 120g wides.
1) Fahaka
2) Buttikoferi
Both of these fish get large, are extremely aggressive and display awesome feeding habits.. They are open-water, active fish, with great personality and are a great conversation subject.. People recognize the striking patterns and coloration immediately when entering the room, not to mention the overall size of each fish. The personality of each fish often reminds people of a dog.. As many great choices there are to choose from out there for large, personality driven fish, I have found these 2 to be the most well-rounded and 'complete' package fish.. I am sure there is more out there that would be great, especially depending on personal preferance and tankspace, but IMO these are both ideal candidates to be single specimen fish.
They are the perfect size because they can live happily for life in a 4ft long tank.. Which is especially appealing if you ever have to move your beloved pet.. If I had the room and the money I would probably upgrade each to a 360g tank with a Mbu Puffer and Green Umbie, as well as an Aba Aba knifefish.
Of course, there are others like Oscars, Red Devils, GT's, Jags that are all very appealing and have great personalities.. but I think they are all too common and you see alot of people have them or them being exchanged into pet stores.. The Butti and Fahaka are a little less known and very active and that makes them that much better!
