Datnoids get big, maybe to big for a 125.You into cichlids????????What about a breeding pair of: Red Devil, Midas, Oscar, Dovii, Amphilopus.....There are some Orinoco Oscar "growouts" for sale on http://tangledupincichlids.com.............
What about...Uaru cichlid and Treadfin Geophagus with a school of glass cats. Then crystal/glass large gravel, with lite blue tinted glass decorations.