They are a little pricey but I can safely say that if you add them, you needn't add any other additives from Kent Marine or Coral Life etc etc.
Try Funky Old Reef Mud to replace trace elements as well as essentials like strontium, iodine, calcium etc as the grains are actually natural argonite that dissolves over time gradually.
Also I have used Reef Energiser and Live sand booster with good results. I want to use the Combo thingy soon but that one is expensive...about $70 a bottle. After I finish using all my other additives...I will just stick to Mark Weis stuff!
Phytoplex from Kent Marine is good though...for feeding all your hard and soft corals as well as anemones, clams etc etc.