I have done 50% water changes many times before & when I upgrade my tanks, I usually use 40-50% of the original water & add new water for the rest. I find my corals loved these massive water changes (as long as salinity & temp. were close). Two weeks ago, I did roughly 120g worth of water changes on my main system & everything is thriving.
Anthony
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If you see it, can take care of it, better get it or put it on hold. Otherwise, it'll be gone & you'll regret it!
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