It depends on the cichlids. The word 'cichlid' covers a huge number of species from across the world. Many love to eat plants while many others don't really care.
I've found with my own tank (2 convicts and 2 africans) that there are exceptions to every rule. I have kept a few swords in my tank and the convicts could care less about the plants though they love to rearrange the gravel. Also if you have any driftwood you could look into keeping various mosses or ferns, they require very little light and maintenance.