Dosing?
All I use is Red Sea Coral Pro for synthetic sea water. 72% of it is comprised of sodium chloride harvested from the Red Sea and the salt crystal have within them the 45 essential trace elements The other 28% consists of all the essential things that a reef aquarium needs which is calcium, Magnesium and Carbonates plus another 12 major elements. No need to add strontium la, this la that la! Seriously speaking when you think its time to do a partial water change you are actually "dosing" your tank. There are a considerable amount of people out there who dont do water changes and all they do is top ups. These guys would probably need to dose their tanks to replenish the elements and minerals which are absorbed by coral growth etc.