Nitrates is a good indicator of the total amount of pollution in a tank.
Water changes are super easy, especially on a weekly basis. IMO
/IME it would not be practical to do water changes more frequently than once weekly, but it can be done. If a tank is accumulating significant nitrate in between water changes, then there is something wrong with the system. These tanks IMO
should not be using any kind of nitrAte reducer or plants because it would be impossible to know how dirty the water really is.
These nitrate reducers and plants are great for stable tanks that do not and WILL NOT have changes to weekly nitrate levels. Nitrate level could increase due to increase fish load, feeding, or fish growth.
nitrate reducing devices are not worth the time or money in the freshwater world since it should not make a difference in routine maintenance and water change. I've spent several dozens of hours researching this topic and have tried adding nitrAte reducing devices like pond matrix, but it was for the purpose of keeping the water cleaner in between water changes. There was no other good explanation I can give for getting these kinds of nutrient exports. I would not use it in overstocked tanks, just like many terrible cichlid tanks out there.