I probably shouldn't be questioning something good like this, but it seems a little too good to be true. I have a well established, cycled 10G that I recently revamped, so I've been checking my water parameters more than normal. It's been 8 days since my last water change, so I thought I'd test my nitrates before doing a water change, just to see where I'm at since my tank has undergone a lot of recent changes. When I checked mid-week, I had 0 nitrates, which seemed odd given that it's fully stocked, but I figured surely I'd have some nitrates before the weekly water change. When I got a 0 on the nitrate test last night, I was shocked and got worried that I had somehow started a new mini-cycle or something. Nope, everything is testing 0 across the board. Before you ask, yes I know how to properly do a nitrate test and have done so countless times before, so I doubt it's user error unless my test liquid was zapped by aliens in the last week or something. Does this sound normal or likely for a planted tank, to have 0 nitrates after more than a week? Is it possible that my plants are really that efficient? And should I worry that my plants aren't getting enough nitrate? I changed the carbon in my HOB filter last week because it hadn't been changed in AGES, but I didn't really think carbon could filter out nitrates. Finally, should I hold off doing a water change or should I proceed as normal just to freshen things up? I've struggled with high nitrates in the past, but never low nitrates, so I'm at a loss. Thanks in advance.
