Quote:
Originally Posted by asylumdown
I'm doing this to show with tests that doing a 100% water change, when done right, isn't dangerous to a system in terms of any of the metrics of "reef health" that we typically measure. I still see a lot of advice out there saying that it's dangerous to do it, but my hypothesis is that for the vast majority of animals out there, even a pretty significant sudden change in parameters like alk and calcium can be easily mitigated and adapted to by the organism.
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The trouble is simply that putting that information out there and a newbie reads it and starts doing 100% waterchanges "the wrong way" and now he crashed his tank. It's not that it can't be done, it's just that some care needs to be taken. Or even a tank that is used to 10% waterchanges for the last 5 years suddenly gets a 100% waterchange is not likely to go over unnoticed by the corals.
Also, it would be very difficult for you to be able to compare say 50% waterchanges which
may show improved color, growth, etc. There is something to be said about disturbing corals and especially exposing them to air (no matter how brief). Generally, corals
do prefer not to be disturbed or exposed to air. Another point is that I wouldn't be treating an SPS tank like this. LPS and softies are much more tolerant. Even small alkalinity spikes for SPS can cause severe damage. Some SPS are
very sensitive, some are generally quite tough (like Montis for example).
It's working for you and your particular tank and corals though, so that's what matters.
