Most of the polyp, mushroom, and leather corals are good choice for beginners. Although symbiotic algae called zooxanthellae hosted within them supply most of their nutritional requirements through photosynthesis they do require supplemental feedings. Supplementing their diet with the addition of iodine, trace elements, marine snow, phytoplankton, and food for filter feeders will help to insure their continued good health. Judt remember you still need the right lighting requirements for them to survive. But if you did your research you will be good. I proper wattage for a reef tank is 4-5 watts per gallon. If you stay in those requirements you will open up a wide range of corals. Another tip is to get them from the same region, as different regions have different temps.