Dosage rate: We recommend starting off dosing 1 drop (0.05ml)/day for each 100L of tank water. If the results are good and depending on the coral density in your tank you can increase steadily to 2-3 drops (0.1-0.15ml)/day over a period of a month or so. Do not dose higher than 4 drops (0.2ml)/day for each 100L of water in a heavily stocked system.