Great question. Consistency is key. I used the Kent products for years and had pretty good success. I also just used baking soda and seas salt with great success. Finally, I did nothing and just ran the water straight from the tap. Guess what? Great success. Whatever I did, whenever I did it, it always seemed to work ok, and I became an advocate of doing less. I like in suburban cook with direct access to Lake Michigan, just like Scubadiver. One thing I would do is avoid driftwood - it releases tanins and can lower your hardness. My tanks were always bare bottom or beach sand. You can use a buffering substrate (basically crushed limestone) and that will help, too.
Good food, clean water, and space and you should have healthy fish.
I have kept and bred many Tangs in our local water with no buffering.
That being said I have had luck triggering some tangs to spawn by adding salt
Are you looking to be involved or commited
A Pig and a Chicken are walking down the road. The Chicken says, "Pig, I was thinking we should open a restaurant!". Pig replies, "What would we call it?". The Chicken responds, "How about ham-n-eggs?" The Pig thinks for a moment and says, No thanks. I'd be committed, but you'd only be involved.