Well i just looked at your profile and from the 4 tanks listed it would be a no, but i'm sure you had more tanks than that before?
Anyway a single fish or a male/female pair only need a 20 gallon tank so if you really wanted one they dont take up much room, for a larger community setting they need a bit more room as they are quite territorial and no tankmates under 3 inches but nothing that can eat a 5 to 6 inch fairly slim profiled fish so no big cichlids or predatory catfish/oddballs, to be honest a species tank is the best way to go.
Have a think about it and if you really want some then i have a 3" juvinile in with my exodons that you can have if you want to drive down and collect it, he went in as a feeder a long while ago when i had far too many fry (they have 2 or 3 hundred with every spawn) and some how survived and grew up so i dont have the heart to off him in one of the other tanks.