I highly recomend getting a skimmer, I put an Aqua C Remora on my Aquapod 24, and my nitrates have remained undetectable while only doing water changes only once a month. If for some reason, you have to leave your tank alone for more than a few weeks, and you dont have a skimmer, problems might arise, but with a skimmer, theres a much greater chance that everything will be ok when you get back.