A good word of advice is: anything you add, whether it be iodine, calcium, magnesium, pH or alkalinity buffers, I would test for.
The next thing is the amount and types of corals and other livestock you wish to maintain or already have. They will have an impact on the depletion time of many of these traces with your tank, through filtration, carbon additives, fish respiration and adsorption and absorption!
I would also have a phosphate and nitrate kit, more so than an ammonia and nitrite kit as once your tank has cycled completely, initially the testing of your water for ammonia and nitrites is very uncommon thereafter, atleast in my experiences. Yes, their are times when you will want to test for ammonia and nitrites, but not as common as with the others listed. _________ 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  | 
coral 
