<a href=showthread.php?s=&postid=13519588#post13519588 target=_blank>Originally posted</a> by J. Montgomery
When I firsts started in the hobby I bought the Red Sea test kit that included pH, ammonia/ammonium, nitrate, and nitrite. I used it a few times, but haven't really checked any of those levels ~2 yr. Once you get the tank setup, you can "look" at the tank and see if something is wrong (i.e. all the corals look bad). If you have a good water source (RO/DI) and practice decent husbandry skills, they should be a big problem.
IMO, the money for those test kits could be better spent elsewhere.