Tony
Many people in europe ,dose additives ,or use the balling method (for maintaining ALK & CA,...) instaed od CA reactor .that is thereason why more than anything for weekly water change to maintain right balance of elements ,not to export nutrients ,your nutrients will be very low any way ,however based on all the research that I have seen & people I talked to the more you change more frequently the better.
Anthony Calfo @ Macna was saying he does do 90% water changes ,untill the fins of the fish is out of water (those are his words),however I find that a bit too aggresive (JMHO) & maybe damaging to your biotope somehow ,because of too sudden of a change in all the parameters.
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