I appreciate your guy's input on this topic - lots already!
I understand the worry people have with such a large water change, and I agree it should be avoided as best as possible. I can't say that I've done one, and most people probably cant (even those who advocate not to do one) - because it gets into an uncomfortable zone.
But one analogy I heard from someone that was successful:
consider yourself as the fish - trapped in a garage with a car running, filling up with exhaust (Phosphate levels) - opening up the garage door to let everyone out as fast as possible may shock you, but is going clean the air and.
simply - each has its benefit and each has its downfall.
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