Done w/ major equipment. Don't think I will ever put on a refugium or sump. Unless I grew from a short 5'1" woman to a strong 6'2" handyman

...my tank won't change....
...EXCEPT I am going to get another SEIO 1100 powerhead for the right corner of the tank. I also am getting a couple bulbs (still trying to deal w/ fuzzy hair algae and cyano - but this is part of the issues I had w/ the tank over the summer, and resetting up/ cycling at new house...)
But those are basic maintenance items anyway, that I hope will help (....crossing fingers).
Anyway, yep...I'm a 'true' minimalist at heart. I'm not about to redo the whole tank. If I can't get the tank to eventually look the way it did in '03 (as you can see in my gallery), and/or it gets progressively worse no matter what I do, I won't start it all over.
But it can be done minimally. I had a heavily stocked tank, lots of purple corralline, several huge anemones (still have them), and a mated pair of Maroon Clowns that produced eggs every month for the past 2 1/2 years (till they died in one night the night I tore the tank down for moving).....all crashed that night....sigh.
I'm trying to start over slowly, 'cooking' most of the rocks in buckets in the dark right now, while only have 3 fishes, some corals, rocks, sand in the tank....no new equipment coming in - just bulbs and another powerhead.
If I could do it that way for almost 5 years, am sure it can be done longer, but maintenance has to be consistent, or one will have issues like I did.
Oh, and I don't know about 'most' minimal tanks not being 'show-worthy' - mine was awesome and beautiful for a long time: