For now, until the tank matures, I would stop carbon dosing. if your seeing bacterial blooms, your overfeeding the bacteria that probably isn't even present yet(A good skimmer will help with them)You mention the tank is new, but how new is new? In comparison, my tank is just over a year old and I didn't even have a need for carbon dosing until it was around 9 months old.
Consistent water changes and some GFO will clear up the nitrate and phosphates for now until your tank matures.