Hello! I'm using an API test to test my nitrates. They are sitting in between 0 ppm and 5 ppm and I have used my two different kits. I just got some carbon to put in my tank to try to get rid of phosphate because I had a big algae outbreak. The algae has been steadily going down thanks in part to that and my tailspot blenny. I am leaving my tank for 2 weeks and my dad is taking care of it for me. I was going to do a water change tonight and add the carbon. I haven't done a water change in weeks. All my parameters are good. I'm worried if I do a water change and add the carbon it will drop my nitrates to 0. I have a pretty big skimmer running, so I'm wondering if a lot of the excess food isn't breaking down and turning into nitrates. Would it be a good idea to run my skimmer only half the day. I'm open to suggestions. When I get back in 2 weeks I might start dosing nitrates. Thanks in advance!