my lack of experience if that is a stressed johanni that thing is bad off! mines lost alot of its black when i set up my 85 gallon and the blues did stay. its the black that went away and turned a shade of grey if you bought those 5 fish from the seller are u shure its not the johanni?
Not a johanni, could be an aurora, but you'd need to let it settle in a bit and feed him up. If it's a female it will never get the color that you are expecting. Most Malawi cichlids only have colored males.