You shouldn't get any spikes in nitrites! I would add it all at once. By the way, how much aragonite are you adding?
The initial addition of aragonite will lower your alkalinity due to precipitation of magnesium carbonate onto the surface until a coating of biofilm develops. "Biofilm basically coats the aragonite grains and exposes the aragonite surface, so that it no longer has an effect on alkalinity".(Delbeek and Sprung: Reef Aquarium Vol.3-2005. _________ 125gal.w/Mag9.5 return(dual megaflow)>Mag7 pump Aqua Cev180skimmer.Wave2k Hamilton Reefstar(2)250watthqi(mh)pend.a Yellow, Naso Tang Red Lip Blenny Percula Clown Demoiselles Niger Trigger F. Wrasses Ceriantharia Orn.Shrimp and Stars Hermits Queen Conch asst. snails> Stars Zoos shrooms Montipora Brains Gorgonians Favia Turbinaria(large+small polyp) Acropora Xenia Tridacna (CroceaMaximaSquamosa) Leathers <35+75gal.reef tank as well> 
"IF THE PHONE DOESN'T RING...IT'S ME"  jb  |