The Fijian Green Acropora (Acropora humilis) is a compact and slower growing form of Acropora coral that exhibits a brilliant green and purple coloration. Like many species of coral, the Acropora humilis will vary it's coloration between green and bluish/purple depending on the lighting used and the corals proximity to the lighting source. This species can thrive under various lighting types and intensities, but always does best with strong water flow. Strong water flow should be considered an absolute requirement for the Fijian Green Acropora to thrive and grow within the reef aquarium. Fijian Green Acropora (Acropora humilis) is not recommended for beginning reef aquarium hobbyists and is considered a difficult species for intermediate reefers and a moderately difficult species for advanced hobbyists. Acropora humilis is categorized as moderate to difficult because of it's requirement for very stable water parameters and very strong turbulent water flow.