Corals Know How to Attract Good Company (IMAGE) ARC Centre of Excellence for Coral Reef Studies Caption Under some light conditions many corals emit a green fluorescence that attracts the symbionts necessary for a healthy life. Credit Craig Humphrey Usage Restrictions Reproduction of image is permitted with correct attribution to the author as listed. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.