If you get something like red sea nopox, it triggers the bacteria inside the liverock (anaerobic bacteria that breaks apart if they get into contact with the aerated water column), to eat your phosphates and nitrates more efficiently. If they don't have proper carbon sources to eat, they don't do as much about it as they can do, so you could also try to see if something like that works for you.
Remember to always make any changes slow, when starting to dose carbon, the anaerobic bacteria will add an increase of ammonia that needs to be balanced before doses can be raised, etc. etc. etc.
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