I say calcium magnesium and phosphate.
RHF:
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I do not recommend that aquarists supplement strontium unless they have measured strontium and found it to be depleted to below 5 ppm. Measuring and supplementing strontium is not a critical activity for most aquarists, and is not a trivial exercise since the available test kits can be difficult to use... It is, however, clearly toxic at elevated concentrations
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