You only need to purchase the elements that are depleted and the dailies, so the initial price can vary. I think I paid just over $200 initially and only needed to buy a couple refills so far. I average an ICP test every 6 weeks now. I run a calcium reactor, which helps with some elements, but contrary to popular belief, calcium reactors don’t always replace certain trace elements, only the ones that actually get absorbed by the skeleton and it’s not a full replacement. A lot of trace elements get consumed by the tissue of the coral or zooxanthellae. There are multiple ways of keeping a reef, this is just one of them.
Most of the elements that Andre sells are $20 a bottle, with a couple that are slightly more. One bottle of the dailies (iron, cobalt, chromium, manganese, etc) will last me 300 days. I use the less concentrated version, so I’m dosing 1mL of each every night, unless one is slightly elevated, in which I would skip using it until the next round of tests come in. For those with bigger tanks, they would choose the concentrated version and would only add a few drops a day, so theres would last even longer. All of this is up to the individual, while some enjoy weekly water changes and others don’t want to do anything and still others choose to do more. It really boils down to what you are willing to do, then you can create a system that works with your schedule or personality.