Depends what kind of cichlid though.
It's ok for Rift valley ones, pH and hardness wise, but even then it's still too sharp to be used 'neat' and needs mixing with gravel so it buffers the pH and hardness but can't be picked up by the fish and expelled through the gills, as it would irritate the gills.
For South American cichlids, coral sand is a definite no-no.