watch with some types of carbon dosing it can increase cyno (unless u cleared up that issue)
Many methods work. Water changes are not suitable for getting nitrate very low, but organic carbon dosing of some form, macroalgae, ats systems, and deep sand beds all work fine. Skimming can also help.
I personally use macroalgae, vinegar dosing, GFO, GAC, and skimming to export nutrients and organics.
Have you looked into Bio-pellet reactors? Good for removing nitrates and phosphates. There are several good threads on them. Just do a search.
Randy, how much vinegar do you dose?
I presently dose about 80 ml per day spread out in several small additions during the daylight hours.
I have a 120 display, but I also have big rock filled refugia where I dose (including 3 x 44 gallon brute cans mostly full of rock)
I have dosed as much as 410 ml per day, but that was too much based on some organisms browning up (like an RBTA) and some white cloudiness in the water.