Testing water

[Potatohead]

I think someone mentioned earlier, this is basically asking if you keep SPS ( mainly acros) or not. If you have a softie or even LPS tank you can likely get away with water changes and likely never having to dose, unless you have a bunch of coralline or something. With a bunch of SPS though you can quite literally lose everything by having your doser stop working and you discover it 24 hours (or even less) later.