Hi I'm back and after pondering over this issue I'm still not convinced.
Folks using the dosers dose Balling salts and Balling trace to get a complete major plus trace elements addition into the tank. They then dose colour elements to colour up their corals.
Folks using calcium reactors with no trace additives get complete major elements and incomplete trace elements. They then dose colour elements to colour up their corals and you say to complete the missing traces.
Based on the above, either the Balling folks end up with excess trace elements since they dose both Balling trace and Colour elements, or the calcium reactor folks end up with incomplete trace elements since they only dose Colour elements and nothing else. Either one or the other is not balanced. Unless you're saying calcium reactor media contains exactly the same trace elements as Balling trace, which goes against common knowledge.
So how exactly should calcium reactor users balance their trace elements with Balling users? I know an alternative system (Aquaforest) uses identical trace elements to Balling trace (strontium/barium + heavy metals + iodine/fluorine) for calcium reactor users, and their Balling users use these same trace elements for their Balling major elements mix too. Should Balling trace also be used for calcium reactor users in the same way?