Originally Posted by AquaKnight
http:///forum/post/2785794
More or less my thoughts as well. I think the absolute main argument is that excess water changes will not hinder your tank (pending you don't like do a 50gal WC on a 55gal and don't match temp/salinity/pH), so if you can do more, why not? Much like guessing how many fish are good for your tank, only you, based on your test readings, can decide what the proper WC schedule is. Much like understocking a tank wouldn't hurt it, doing frequent WC's won't hurt anything.
As far as not doing WC's, I can't see it. The best way to describe water changes are a blanket buffer. If you have a tank heavy stocked with corals, and don't do WC and just supplement, you're doing just that, supplementing only those very specific compounds. If do WC's and don't dose, they will help bring up the levels, and if you WC's and dose, if you happen to dose too much of a certain element, lithium for instance (a neurotoxin in SW) is found in almost every one of those genernic 'trace elements' bottles, WC's will help buffer that level down. There's also the fact that no one really, truly knows exactly each and every element corals issue, and how the corals use. Doing WC's will bring (or at least attempt) to bring every element back to normal.
This can also be directly applied to skimmers. No one really knows what your specific skimmer, exactly removes. Especially once you start to combine the skimmer with even more unknowns, like Ozone and/or UV. While you can overskim a reef, I am a big fan of big skimmers, and I don't feel Sly's MSX 160 on a 72gal is close overskimming. Something like an EuroReef RC250 on a 55gal. However continuing WC's as mentioned above is crucial.
Kalkwasser, Magnesium, Reef Plus and Reef Trace.
The Magnesium, is there because it is a vital element for calcium/strontium incorporation by the corals. Plus adding Kalk reduces your magesium amounts. Reef Trace and Reef Plus give you added elements that a water change will bring.
You can do it either way, but I'm finding more and more that water changes are less necessary with proper filtration.
No need to over anaylize things.