I have this lone adult damii in a fish tank full of Paretroplus dambabe and Ptychochromis oligoacanthus. He measures close to 14 inches and loves to sift sand, the spot on the "shoulder" of the pectoral fins is characteristic of this species. The quality of the video is poor but I couldn't wait to post 
http://m.youtube.com/watch?feature=youtu.be&v=mc6mS_kuSoI
http://m.youtube.com/watch?feature=youtu.be&v=mc6mS_kuSoI