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Bacterial resistance to different antimicrobial agents is growing with alarming speed, especially when bacterial cells are living in biofilm. Hybrid nanoparticles, synthesized through the green method, hold promise as a potential solution to this challenge. In this study, 66 actinomycete strains were isolated from three distinct marine sources: marine sediment, the algae <i>Codium bursa</i>, and the marine sponge <i>Chondrosia reniformis</i>. From the entirety of the isolated strains, one strain, S26, identified as <i>Saccharopolyspora erythrea</i>, was selected based on its taxonomic position and significant antimicrobial activity. Using the biomass of the selected marine <i>Actinobacteria</i>, the green synthesis of eco-friendly silver carbonate nanoparticles (BioAg₂CO₃NPs) is reported for the first time in this pioneering study. The BioAg₂CO₃NPs were characterized using different spectroscopic and microscopic analyses; the synthesized BioAg₂CO₃NPs primarily exhibit a triangular shape, with an approximate size of 100 nm. Biological activity evaluation indicated that the BioAg₂CO₃NPs exhibited good antimicrobial activity against all tested microorganisms and were able to remove 58% of the biofilm formed by the <i>Klebsiella pneumoniae</i> kp6 strain.