No offense to my fellow Canuck Lee Newman, but IMO the pitting & bloating that Lee mentions in his article is caused from bacteria that is typically not found in these fishes native waters, primarily Spironucleus vortens, and IME it also affects S. jurupari and S. leucosticta. Myself, Matt, and Tom all commented about HITH in the following past discussion, with relation to some of the SA species and their relative ease at getting HITH.
http://www.monsterfishkeepers.com/forums/showthread.php?548799-HITH-lATERAL-LINE-DISEASE-IN-CICHLA
IMO it's a bit more involved than just "poor water quality", or poor diet, as many people believe. In Lee's defense a lot of this info was not common knowledge back in 1996 when his article was first published.