Crystallized trace elements for the strengthening of all invertebrates. Tropic Marin Pro-Coral Mineral contains all the trace elements found in natural seawater, including iodine and strontium, in Tropic Marin's proven combination. Pro-Coral Mineral's crystalline form makes it possible to offer a much higher trace element concentration than in a liquid additive, without the need for chelates, phosphates or nitrates. In this way, the aquarium inhabitants gain the full benefit of these essential minerals resulting in enhanced growth, colouration and robustness. Reef aquaria with dense coral populations will especially benefit from Pro-Coral Mineral - the pure mineral trace element concentrate.