Randy Holmes-Farley
Reef Chemist
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My Tank Thread
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depending on your water source I think the initial water fill would be fine just standard tap water. I filled my 500 with tap water first time, and RO/DI since then with no issues. I also remember Jake from Reef Builders mentioning a few years ago that he just ran RO water, no DI I think. Id get your water tested and go from there.
You and your next door neighbor on the same water supply can have totally different levels of copper as it usually comes from your own pipes.
Tap water is hit or miss, and someone getting a hit is not an indication that you will.