Only tip I can suggest is READ! Alot.... and regards to keeping great water levels is simply do your scheduled maintainence and always keep an eye on levels.
This is my regiment so you can get an idea.
Feed fishes daily. Foods: frozen formula1&2, frozen mysis, freeze dried krill, (frozen angel formula<~~ my guys love this crap ALOT), and spectrum marine formula pellets. I soak these foods in vitachem and a couple drops of kents garlic extreme with just a couple drops of saltwater to allow every piece to soak. I use the garlic extreme 3x a week as well(Mon, Wed, Fri) and vitachem daily.
Corals: freeze dried cyclopeeze, and DT's phytoplankton. feed them 3x a week: Mon,Wed, and Fridays. Also give my hammer, bubble and frogspawn zooplankton once a week.
Dose tank with seachem calcium twice a week(Tuesday and Friday)
and dose Kent Marine Iodine through drops daily.
Conduct a 10% water change every 2 weeks and so far this has worked out great for me with no disease or ill effects to any corals. With all that said my levels run almost perfect because there is always slight fluctuation(extremely minimal)
Thanks again!
Nick