Boulengerochromis microlepis is the largest, give or take a monster Peacock Bass.
Like Unexpected said Red Devils can get upwards of 14". Like some of the other large CA cichlids (Tri-Mac, Viejas, Midas, Jaguars, and Dovii or Wolf Cichlids)
i agree with orion tangs rock!!! except some of the cooler ones are a little harder to find huh? im figuring this out now with an almost empty fish tank haha...