I agree you should worry about nitrates when adding water but the main problem with tap water is phosphates. Have it tested with a tds meter and see what that comes out too.
I would never add tap to a reef.
If you use tap water you must let it sit for 24hours so the chlorine evaporates before you add it. HOWEVER, if you plan to last a long time in this hobby and do more than fish only I would highly recommend spending money on a RO filter. I tried to do the cheap thing for the first year then I realized how good of an investment an RO fitler is. Plus lugging 5 gallon jugs up and down stairs suck!
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