No because here's why water that comes from faucets have of course chlorine, chlormine ,flourides, many metals. lot's of lime salt deposits,
calcium', phosphates, nitrates, Bad bacteria which all causes fish stress and diseases which in aquariums all relate to poor fish health and
ICH which does not exsist in the ocean first of all and secondly I would not trust what your LFS said that's just to get you to spend money for you to go visit them with accuring problems please be aware them bad shop that seam to be good can only cost you in the end so be aware of what's happening and take my advice not there's I guarentee you that this is true not to be gung hoo about it but this is my opinion and my opinion is good I've been in this hobbie all my life since I was 7 and in just a few day's from now I will be 43 years old ohhh boyyy!!! But I have seen a lot of fish stores and they all can give you good advice or bad advice it all relates on the customer! Back in the day when people came to me and asked about salt tanks and reefs I sent them to a good freind of mine to his fish store that he owened and I helped him alot and by the way he in return would give me corals or what ever I needed we would also travel together long distance to purchuse fish corals and supplies for his store thru local dealers and about 50 % of the time we would not end up buying anytjing from them because there set ups where not in order because we would allways walk the exhbit and see if anything was not right and we found several things wrong such as water qualities etc. It was a struggle to find a dealer that was trustfull being that said you do the same and you will see a differance in what people have to say!