I have been using the ABCD for the past 4 months and I have noticed improvements in my colors. I do have the reef colors test kit and I have been making adjustment to my dosing. I am dosing 5 ml twice a week of the BCD, and just 5ml of the A once a week.
Note; I am using an auto doser now and sense using the doser I have noticed better results instead of dosing manually
I am also using a balling method with a different product and this has also helped with my colors. I am going to switch away from the ABCD to the product line that I am using for the balling method to see what my results will be.
I have used Red Sea products for sometime now, with my old setup with a 10 year break and now with my new system with consistent results, Start slow and check you colors, from what I found you really need to watch the iodine levels. My iron is always low, same as my K. As in regard to D dosing and what I have researched is that you should dose D in equal parts. What I am doing is dosing D in equal amounts as I am Doing BC for the reason that my iodine levels are inline.
Hope the gets you closer to you answer