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; 03-09-2015 at 11:35 PM.
Reason: More
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