Welcome to R2R! Do you know why it is cloudy? Cloudy water on a new tank can be caused by suspended sand particles if you have fine-grained sand (if bare-bottomed obviously not the case) or a phytoplankton bloom (would have a slightly greenish tint to it) or a bacterial bloom (usually a whiteish tint--but suspended sand is also usually whiteish), maybe even a few others I didn't think of like micro-bubbles can make a tank appear cloudy also. If it is phytoplankton the quickest fix is a small hang-in-the-tank UV Sterilizer. The same UV Sterilizer would help with a bacterial bloom but probably not as quickly. If it is sand my advice would be to be patient. It will clear eventually. Carbon will help some in all of these cases so it is not a bad solution if you don't know the origin of the issue.
