tanks dominated by stony corals need additives to increase the Ca,mg, kh level, this and that. I believe that it is good to add strontium. I actually doubt that u can keep your Ca, mg...etc level in check through frequent water changes in stony dominated tanks. BUt for softies and fowlr, it should be alright though.
Dosing as in what additives to add and how u add it...like via a dosing pump, gravity drip system....