I have three of these wonderful devils in my 110. I got them at petsmart I guess almost 2 years ago when they were the size of the bowl on a tablespoon. The biggest one is about 4 1/2" long now, and the other two are pushing 4". They live in a 110 with a pair of bichirs (who they used to terrorize before the bichirs got up over about 7"), an albino ancistrus, and the swordtails who have outgrown food size. They come out of their caves when I walk up to the tank and beg for food. Their all time favorite thing is hikari sinking carnivore pellets. They also tear up beefheart cubes, krill cubes, and, of all things, coarsely chopped (and very well rinsed) chicken liver. I recommend keeping about 20 gallons of livebearer (or rosy minnow, white cloud, convict, or any other just add water, makes its own fry kind of fish) breeding space for each bushfish, though, because inch to inch and a half long fry are their all time favorite food item. When I got them, I had a 25 high that I had probably 50 feeder guppies (home bred) in. I stuck these three little guys in there, and in a week, they were the only fish in the tank. And this was when they were an inch and a half long. They make short work of fully grown guppies at any age. They can take a fully grown Platy
or sphenops molly or male Swordtail
(not female, though) now that they're nearly full sized.
I am also advised (on this forum, I believe) that If you have a half dozen or more, they will hunt in a pack.
Being as they're anabantoids, which are largely fairly short lived fish, when these fellows pass, I'll set up a 40 or 55 with guppies (probably a mix of fancy and feeder), and let them grow out to fill the tank out, then drop in a half dozen Ctenos and let them clear the tank, then grow out for a year and a half before plunking them in with the bichirs.