Fresh2o
Aquarium Advice Addict
I don't remember exactly but there was little to no nitrite and ammonium and the smallest amount of nitrate the only thing that needed the slightest attention is water hardness has to do with where I live next time I do a water change I'm going to put some RO water in there!!
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Without a test kit or actual readings, you will have no idea how much you will be altering the pH and hardness.
Did the LFS say how much RO they are adding to their water?
If you can't measure it, then don't mess with it.
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