Rubidium Supplement – Advanced Trace Element for Reef Balance Includes a dosing dropper! Fine-tune your reef with our high-purity Rubidium supplement. Though not often spotlighted, Rubidium is naturally present in seawater and plays a subtle but important role in maintaining ionic balance and supporting coral physiology—especially in complex SPS systems. Key Benefits: - Helps maintain natural ionic ratios in reef systems - Supports coral tissue health and metabolic function - Enhances stability in trace element profiles - Ideal for advanced aquarists seeking complete seawater replication Rubidium is easily stripped out by filtration and protein skimming. Regular dosing helps ensure even the most overlooked trace elements remain in balance. DIRECTIONS: Before dosing product, an ICP test should be completed to assess current tank trace element levels and target levels. See dosing calculation on website to obtain the dosing amount for your tank based on the current and target levels. Dosing should occur in high flow areas, and can be done over a period of time (recommended).  Complete another ICP test in a month to understand trace element depletion levels in your tank and determine how much you should dose to maintain trace levels.  Size​/​Option: 120 mL