Achilles is good! If you've got the time to invest in it, go for it! I can even drop ya a line when I see a good one!
Its just a question of getting the fish to even eat, which sometimes they don't and just die... You need to feed a variety of stuff 3 times a day. You have to build on its immune system and pack it with food, otherwise they seriously become over-run with parasites and just dwindle.
Once they're healthy and established, took mine 3 or so months... They become super aggressive/hardy and will attempt to kill anything new, in my tank at least...
I figure I have another year-1.5 until I need a 6 foot tank.