Well, it depends. What kind of substarate do you have? I use crushed coral, and it sometimes makes the water a bit cloudy when I clean or rearrange the tank.
Also, are you adding anything to the water? I know that there is Transclear, which is what I use to clear my water. Real cheap too.
What kind of filter do you have? Can you change the filter speed any? If you can, bump it as high as it can go. This will help get the water clearer. I do this when I clean and vaccum my tank because the substrate makes the water cloudy.
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