1. high cost Very labour use 2. take a long time to see results. 3. if made without careful. The material might destroy coral reefs closest to the life. 4. There must be a space where to place considerably because it is easier to lose, such as sinking in the sand was blowing there cover sedimentation, wave flow was mostly used to take. As the material is not appropriate per. The island of soft corals.
การแปล กรุณารอสักครู่..
