I say Yes. you don't want any nute uptake anyway.
If your tap is 7, most nutes I know bring the pH down a little so you'll probably be OK but, why not just check it. It takes a few seconds.
Like Umbra said, depending on what nute you're using determines what pH you want. There's a nice chart around somewhere that shows what major nutes are best taken in at what pH. I'll see if I can dig it up.
EDIT: Found it. Not sure just how accurate this is. The Cal-Mag bottle says 6.2 to 6.3. This chart shows a little higher. Buyer beware.
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