You are right - you just insert the Alk, MG, CA into the tank which is needed. With only water change and a ton of corals - it could happen that it consumes the alk a day later - not with balling light.
And the trick is not only about dosing the alk, ca and mg - but dosing the correct trace elements in the needed amount every day which makes the tank much more stable and prevent the OTS..
I understand all that but I think most people are already doing the alk/Mag/cal dosing whether it be DIY/ BRS or one of the many brands out there. Where you lost me is the extra stuff added that you can't test for, how would you ever know how much of each element your adding and what your tanks demand is? Some think OTS is caused by a build up of elements that our tanks aren't using as opposed to a lack of elements.
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