"Yellow cloudy water in a saltwater aquarium is caused by Dissolved Organic Compounds (DOC’s) or proteins. To reduce the amount of protein in your tank, protein skimmers work exceptionally well. Reducing the amount of food that is fed to fish and other creatures in the tank, as well as vacuuming uneaten food, detritus, and substrate on a regular basis can help to maintain a clear aquarium. Increasing the tank’s biological filtration is also recommended as it serves as a breeding ground for bacteria." From what i have been reading you need a better skimmer and maybe a filter system but photos will help on my call