A fish-only tank with no fish?
Is the water foul? If not ... is there really a need for the water changeover?
I guess I'm more of the philosophy of "If it aint broke don't fix it". Unless you knew the water had issues, I'd be inclined to just start using RO as the top off and make future water changes with the RO, but wouldn't see a need to do a 100% changeout just because I was switching to RO.
Not knocking the 100% change though .. sometimes it's necessary.. But in this case I wouldn't automatically guess it would be necessary unless there are other factors to consider.
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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