I set up my first reef tank a little over 2 years ago and have always tried to do weekly 15% water changes. I was recently away from college and had my parents looking after the tank and due to a lack of time, they couldn't get to a water change for over a month, which is by far the longest the tank has gone without a water change. Combined this with the fact that they were feeding extremely heavily, and I expected to come back to a massive nutrient issue, but to my shock, the nitrates and phosphates were both at 0.00 (both checked with Hannah checkers, tested twice since I didn't believe them the first time). The alkalinity was pretty depleted so I had to dose soda ash to get it back in check and I toned down the skimmer to try and get some nutrients back but other than that, this is the best my tank has ever looked, and aside from a ton of coralline algae, there's absolutely no nuisance algae in sight. Now I'm starting to wonder if I could save myself and my parents a lot of hassle and stop doing water changes, and instead dose additives to make sure nothing gets too depleted (probably All for Reef). Alternatively, I'm wondering if I should just go down to 1 water change a month so I still have some water being exchanged, but not nearly as much as I currently do. I'm just interested in hearing everyone's thoughts on this.