Major Balancing Act After sorting out the flow and light,  getting nutrients balanced well, coral will start to grow,  fast.  When they do, they start to take up elements from water to build their aragonite skeleton. As the result,  ions such as calcium, magnesium, strontium ans carbonate are removed from water column.  At the same time,  other major ions such as sodium, chloride and sulfate are largely untouched.  If the consumed ions are not replenished,  disaster can happen.  The co