I keep Ackies and I love them! Great personality and tenacity in a small package. I find that they will use all available space you give them, not just floor space. Check out my thread.
http://www.monsterfishkeepers.com/forums/showthread.php?526367-A-LONG-overdue-Ackie-photo-shoot
http://www.monsterfishkeepers.com/forums/showthread.php?526367-A-LONG-overdue-Ackie-photo-shoot