They can also be used to help threatened coral reefs. A bacterial probiotic has helped slow the spread of stony coral tissue loss disease (SCTLD) in wild corals in Florida that were already infected with the disease. What is stony coral tissue loss disease (SCTLD)? A great star coral (Montastraea cavernosa) colony infected with stony coral tissue lossdisease (SCTLD) on the coral reef in Fort Lauderdale, FL. The lesion, where the white band of tissue occurs, typically moves across the coral, killing coral tissue along the way.