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Recently I bought a 75 gallon used tank. Right now it is not cycled because I have a couple of water quality issues. The parameters of the tap water are: Ammonia: 0.25 ppm Nitrite: 0.0 ppm Nitrate: 10.0 ppm pH: 8.2 KH: 53.7 ppm GH: 89.5 ppm However after letting the water sit for 24 hours, the parameters are: Ammonia: 0.25 ppm Nitrite: 0.0 ppm Nitrate: 10.0 ppm pH: 7.4 KH: 53.7 ppm GH: 89.5 ppm I was told in another thread that the reason by pH is unstable because my KH is so low. I added some crushed coral as a substrate to combat this and it has completely clouded the water. So much so that I can't even see the filtration or hoses when looking through the front. There is also some school of thought that as the bacteria start to colonize the substrate that their biofilm will "pull down" the suspended particles. Another concern I have is when I do cleanings I will have to move around the crushed coral. This will create yet another cloud. Will it clear up eventually and the water be crystal clear or will it remain slightly cloudy always? Should I remove the crushed coral and rinse it more?