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Abstract Coral reef biodiversity is maintained by a complex network of nutrient recycling among organisms. Sponges assimilate nutrients produced by other organisms like coral and algae, releasing them as particulate and dissolved matter, but to date, only a single trophic link between sponge-derived dissolved matter and a macroalgae has been identified. We sought to determine if sponge-coral nutrient exchange is reciprocal using a stable isotope ‘pulse-chase’ experiment to trace the uptake of¹³C and¹⁵N sponge-derived matter by the coral holobiont for three coral species (Acropora cervicornis, Orbicella faveolata, andEunicea flexuosa). Coral holobionts incorporated 2.3–26.8x more¹⁵N than¹³C from sponge-derived matter andA. cervicornisincorporated more of both C and N than the other corals. Differential isotopic incorporation among coral species aligns with their ecophysiological characteristics (e.g., morphology, Symbiodiniaceae density). Our results elucidate a recycling pathway on coral reefs that has implications for improving coral aquaculture and management approaches.