you need somthing that can hold its own like a Red Devil,Managuense,Midas my female is in with a jd knife fish shovelnose orange pike,clarias cat and is fine as i say the males can be a bit 
Salty said:I wouldn't do it not unless your buying say a 3" juvi and planning on moving him. Listen to stotty n others, dovii get huge, 2-3 feet + just look at em they just look mean. I've heard minimum for an adult male only is like 200-250g. Get a jag, they are like smaller versions + can be housed in smaller tanks like 120g. even tho that sounds huge to me. theres a good article on dovii in (Tropical Fish Hobbyist) nov. 2003 if you could check it out. - salty