They are all carbon sources, bio pellets are polymers which break down into sugars which break down into ethanol (vodka), which break down into acetic acid (vinegar). Bio pellets need to have the effluant directed into a good protein skimmer, they all promote the reproduction of bacteria which utilize some po4 and no3 in their cells and get removed through skimming, carbon dosing usually requires some additional means of exporting po4 such as gfo and no3 reduction can be slow but once reduced is easily maintained, if you have really high no3 you may need to reduce it through some other means such as WC or some other denitrator first then carbon dosing can maintain it. Always go slow with carbon dosing, vinegar is your safest but you have to consider your ph, dosed slowly throughout the day is ok, vinegar is also less likely to promote cyano.
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