tap for res?

Depends on what kinds of crap you have in it (ie chloramine, chlorine...) but it's generally better to use RO.
 
That tap water is fine in most cases it is good to use ro water and add back 200 ppms of tap water.
 
Go with the tap water. If it's drinkable there shoudn't be any problems.
A grower would be better to go with a bottled spring water for res over RO or distilled in the event that the available water source is unacceptable.
 
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