From what I understand all the ATI bulbs are able to grow coral and it is a matter of taste which ones you use. I have an 8 bulb and use a combo of Blue+, Coral+,Actinic and purple+. I had an Aquablue special but it was too intense for my liking. When I ordered my fixture I ordered 3 extra bulbs so I could play with the look of the tank. I'll save the extras for bulb changes down the road.