If you do not have the time and energy to do that, then I'd suggest a trace element mix dosed at the recommended level using an additive mix from a company you trust, such as Tropic Marin A and K.
This is actually what I started to do at Randy’s suggestion for my 25 Lagoon softy tank. I do a weekly 4.5 gallon water change on my softy tank to keep Alk, Ca and Mg where it should be. Over the course of a week I see slight drop in Ca and Mg. The water change fixes this. I then dose Tropic Marin A & K daily at their suggested dose of 1ml to 100 liters which works out to .68ml of A & K. I have see. No negative effects after a week of this. I swear I see increased growth in my Zoas, lots of new polyps over the last week. I sent off an ICP test after a few days of dosing to see how many come back elevated. We’ll see what happens.