No need. According to the inquiry of Shencaotang Health Network, the activated carbon and coral stones in seafood tanks need to be replaced regularly to keep the water quality clean and stable. Coral stone, coral is a kind of coelenterate that lives in the ocean with beautiful posture and elegant color, named coral. Coral can secrete red and white calcareous bones, which stick together in clusters and are dendritic, called coral stones. Activated carbon is a specially treated carbon. Organic raw materials are heated under the condition of air isolation, so that non-carbon components are reduced, and then react with gas, and the surface is eroded, resulting in a structure with developed micropores.