Have 46 gallon Bow tank,seems to be going good,there is about 50 lbs of liferock in it and have 5 fish and a lot of zoa's....anyways was wondering about water changes is there like a rule of thumb as to when and how much after tank is cycled...as of right now i do 10 gallons every 2 weeks..but zoa's seem to be shrinking.. would adding a drop of iodine a day help.. i also add a cap full (5 ml) of each Seachem Reef Fusion 1 and 2 daily plus...Red Sea KH Coralline Gro (5 ml) daily also......Looking for advice Thanks in advance...Rich


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