Check the listing for details. Red Sea Trace Colors ABCD Starter Pack 4x 100mL Complete Coral Color Supplements. Condition: New. Listed at 34.99 USD. Red Sea Trace Colors ABCD Starter Pack 4x 100mL Provides the 31 minor and trace elements required by corals.Red Sea Trace Colors ABCD Starter Pack provides the 31 minor and trace elements required by corals: Trace Colors A – Halogens (I2, Br2, F2) Trace Colors B – Potassium & Boron Trace Colors C – Fe & 7 Complementary Metals Trace Colors D – 18 Bioactive Trace Elements Red Sea Trace Colors ABCD supplements contain the 31 minor and trace elements present in the skeleton and soft tissue of all corals.The elements in each supplement are related by their biological function and are associated with the production of specific color pigments (Pink, Red, Green/Yellow and Purple/Blue) in the soft tissue of stony corals. All 31 elements are required by all stony corals irrespective of the actual color the coral displays.Concentration: Trace Colors A: 1 mL will raise the iodine level of 100 liters (25 gal) by 0.03 ppm. Trace Colors B: 1 mL will raise the potassium level of 100 liters (25 gal) by 1.75 ppm. Trace Colors C: 1 mL will raise the Iron level of 100 liters (25 gal) by 0.01 ppm. Trace Colors D: n/a Package Size / Volume:4× 100 mL (4x 3.38 fl. oz.)