Pictured above is a light blue-green Acropora loisettae growing among other SPS corals. This particular Acro will grow long, thing branches. This mini-colony started out as a 1/2″ frag, that quickly encrusted onto the surrounding rocks and eventually grew more branches. Most Acro corals do very well under T5HO lighting, and even thrive long-term. Metal halides are not a requirement to keep these corals.