Tap
I've always used ro water at the least but the one time I used tap they were fixing plumbing around my neighbourhood and I didn't know, so it crashed my tank and I lost slot of very nice corals. Not worth chancing in my opinion. However In the past 3 weeks my tapwater is testing at 3ppm so it's pretty damn clean.
Last edited by canadianbudz604; 03-10-2015 at 12:35 AM.
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