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That is the beauty of test kit readings. They will tell us when something is off. With the ~1 month/2 month startup time minimum I would not replace lightly. (not to mention the cost of aragonite per pound most places) When your test results start to indicate the RDSB is failing then replace.
If you feel you must replace then perhaps the best bet is to do a dual setup where you replace 1/2 on alternate time tables....
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220 & 200 graveyard: Golden Puffer, Purple Tang, Dogface Puffer, Juv. Emp. Angel, Miniatus, Longhorn Cowfish, Juv French Angel. Spec-Only Angler tank.
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