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UK Reef Club Member
Yes and it’s getting more and more common this days, although the dosing of carbon and nitrates simultaneously to reduce phosphates is not very well known in the hobby for some reason as a alternative to medias.Lots of people dose nitrate or phosphate, and that can help boost export of the other one of the N/P pair, but it’s not a magic bullet to keep other nutrients in check.
It only works if one of them is currently limiting export of the other. In many cases, something else is limiting (iron, manganese, light, space, etc).