Fiji Acropora gemmifera were some of the most amazing and colorful corals one could own. Alas, they are no longer imported, and a lack of understanding with regard to their care means that very few of them still exist in the hobby. Luckily, I and a few friends have a knack for them. This coral has been in captivity for close to 10 years now.
Under LEDs, this coral has a teal base, purple corallites, sky blue tips ( that aren't showing well in the photo) with brighter purple axial corallites, and dark polyps with a single bright yellow-green tentacle. Axial polyps are solid yellow-green. Under 14k halides, the base color was the color of mashed bananas, hence the name. That color seems to be exclusive to halides, though.
First pic is under daylight spectrum LED, second pic is from my old original colony under Ushio 14k metal halide, which shows off the blue tips better. Frags are 3/4 to 1in. Tons of light & flow!