Biggest benefit to your system: A Rodi system or a DI system at least. U will be battling algae issues all day long with those lights blasting down with tap water. *unless ur house tap has low TDS.
Assuming u do 20% wc a week, a DI unit will suffice. Just have to replace the media when its exhausted (again depending on ur tap water tds)
That was my newbie mistake running tap water, and having issues all the time.
Would recommand looking out for 2nd hand DI units on this forum, and get ur replacement media from madpetz. A 3 stage DI will do a good job reducing the overall TDS.