Some people with well stocked and well fed tanks need no additional macro supplementation. Their nutrients are supplied by feeding. If you see no change in macro concentrations you may not need additional supplementation. In your case uptake of nutrients is probably limited by light or CO2 and the fish waste produced matches those levels. This is good, it means you are close to a natural balance. Those who dose daily often have strong lighting that burns off nutrients much faster than their stocking and feeding provides. They need to add more nutrients for their plants.Bert H said:I find no measureable drop in NO3 levels during the week. I do have well-stocked tanks and feed daily.
Try not adding macros and monitor your average daily NO3 change. Then if you find that you use say 2 ppm NO3 each day and run out by week's end, you could add a calculated 2ppm NO3 each day to maintain your NO3 at low but adequate concentrations. The key terminology here is supplementation rather than dosing. You use fertilizers to make sure your plants have enough nutrients to meet your gardening intrests but also use your plants to reduce the toxic byproducts of animal life. The fish are your primary nutrient source, fertilizers supplement deficiencies in that nutrient source.