if the tetra are being skittish id make sure they arent nipping the cichlids. i think your best bet might be to add more tetra in the hopes the activity makes the cichlids more comfortable. both tiger barbs and columbian tetra would be pretty good at small eating fry that arent hiding as others have said. i think hachet fish make good dithers for breeding SA cichlids because of their upturned mouths.