Yellow water in a closed system is an effect due to the accumulation of dissolved large organic compounds. While activated carbon or ozone can be used to manage it, one must remember this.
The accumulation of dissolved organic carbon which caused yellow water can reduce the amount of light reaching our corals and reduces uv penetration through the water so when using a chemical filtration method to prevent this one must make sure not to remove the organic carbon to fast since the sudden increase in light and uv level can shock the corals and may cause bleaching. An interesting study on this was preformed my Bingman in 1995
Also note worthy is the fact that the yellowing happens so slowly that most hobbyist do not notice the change because they view there tanks several times a day. Also the use of high Kelvin lighting can mask the yellow color due to the high blue output