Yeah, I have no problems at all with the Aro, and Needlenose, as long as they have enough room, they should be fine. But like I said too, you have to make sure you feed them good.
My Aro, is about 18 inches, and my Needlenose is about 10 inches, no problems!!!!
Good luck to you on whatever you do, they are cool little guys, especailly when they eat.
Jeanna