the picture above, that red devil cichlid is about 10 inches from snout to tail. no joke! and the one behind it is about 8 inches. they are housed in a 125 gallon tank. which is divided into two, otherwise they'd be at each others throats. here are some more pix.
the male above is smaller, but he had some babies with the female, which is housed in a different 55 gallon than he is. no space for anymore babies. lol