Like many have chanted stability is key and unless you are determined enough and can be around the aquarium often then automation is your friend as long as it is redundant and reliable IMO. Yes this can mean buying expensive equipment, but you are paying for peace of mind and not having to be a slave to the aquarium. This is why I will never use a system where I am required to do something daily (zeo/ AF) because alot of us have busy lives that take us away from the aquarium, I was traveling alot this spring and started a new relationship, my tank got badly neglected, went two months without a waterchange, no testing, very little dosing, only thing I found the time to do was to feed my fish or have someone feed them for me.
Then when life slowed down I busted out the razor blade. I thought I would find a few dead corals after scraping the glass, some had lost some color but all were alive and had grown significantly. Tank was on autopilot and did well. First water test 5/20 was only .5 lower in DKH than it was on 1/19.
If I didn't invest well underneath my aquarium, then I would have lost my investment inside my aquarium. If you are the type who can be around 365 days a year and take minimal vacations or time away from the tank and you think you can commit to daily tasks, dosing, weekly testing, water changes, buy all means let my advice go in one ear and out the other.