Agreed all..all tanks, setup, fishes, corals are different..u really got to test n experience things then u will start learning things..keep changing water is no wrong n is good for fishes, just that keep changing is costly n time consuming n shag..haha..all things must try to strike a balance..I m trying out bi-weekly 40% wc with biosphere n algone keeping NO3 low..hope it work well..cheers n happy reefing