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Hello.sorry for the reposting this again.
My central water system is very complicated.still i coud not solve this problem.tap water ph level 6.5 water hardness about 15 ppm and very low alkalinity they add hydrated lime to adjust ph when i add this water in to the aquarium ph goes down immediately so sponge filter mainly affecte for this i checked and also i have add crashed coral all the tank but not any positive thing.what can i do for this without commercial buffering.
My central water system is very complicated.still i coud not solve this problem.tap water ph level 6.5 water hardness about 15 ppm and very low alkalinity they add hydrated lime to adjust ph when i add this water in to the aquarium ph goes down immediately so sponge filter mainly affecte for this i checked and also i have add crashed coral all the tank but not any positive thing.what can i do for this without commercial buffering.