You can’t call a coral a plant or a stone. It is rather a group of animals. Coral is a combination of plants (algae) and animals (polyps). Polyps are known to have a great relationship with algae and they come together to form small calcium housings that create layers on each other. Also, polyps emit … Continue reading Can You Put Dead Coral In A Freshwater Tank? [If So, How To Assure A Healthy Introduction]