Sincere thank to Professor Bernie Degnan, who supervised and gave suggestion throughout the study period. Also thank to Jo Bayes, Jaret Bilewitch, Andrew Calcino, who helped during the experimental period on the Island and with website development. Thank to Fabian Aviles, who helped with the experimental design and progress of the project on the Island. Thank you to Francesco Bancala and Low Hong Wen Dolyce, who help with photo taking. I also wish to express my gratitude to the following persons who helped with specimens collections on Heron Island: Low Hong Wen Dolyce, Terence Tan, Hera Ho, Yvonne Loh Yiwen, and Delwyn Goh. Specieal thank to Low Hong Wen for Plakobranchus ocellatus data. Lastly thank you to Lina Daddow who helped in preparing the histological sections.