If you keep cichlids and you acquire healthy stock, then the fish health problems you experience are of your own making. What does that mean? Inevitably, it means you aren't doing something (or several things) well enough to maintain healthy fish.
Yes, even expert cichlidophiles can experience sick fish. However, the probability of experiencing problems will increase exponentially with each of the recommendations below that you don't follow. These are assuming that your aquarium is appropriately cycled.
I can assure you that if you adhere to the tips above, you WILL experience less frequent health problems with your fish.
The Cichlid Room Companion
Tropical Fish Hobbyist
American Cichlid Assoc.
African Cichlid Hub