Used to do 20% bi-weekly on my 100 gallon and really noticed a difference in my SPS. Started dosing Prodibio and switched to 10% bi-weekly changes with the same results. I have been doing this faithfully for almost a year and the growth rates of my corals have been awesome. Before hand, I was a real lazy water changer--the only changes I did was topping up fresh water from evaporation.
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