Coral Essentials, Coral Power Trace-A is a blend of strontium (50,000 ppm) and bar. Stront in natural sea water is a row of 8-10 ppm. Keeping a strontium at this level is indicated and does not go beyond the range of 5-15 ppm. An unconfirmed evidence showed that strontium content below 5 ppm in marine aquarium is harmful to the growth of coral. In the case of advanced aquarists, the level of strontium in marine tanks should be checked regularly to determine its absorption in the system. Calculate the consumption of strontium through regular tests, and then simply calculate the dosing need to adapt them to the depletion rate. Then continue checking the strontium level every week or two.