Sabu, D.M., Lukas, A.Y.H. and Salosso, Y. 2022. Ammonia reduction by different thickness coral shard filter in cultivation of Catfish (Pangasius sp). IJOTA (Indonesian Journal of Tropical Aquatic). 5, 2 (Aug. 2022), 142–149. DOI:https://doi.org/10.22219/ijota.v5i2.22835.