03-02-2004, 03:57 PM
Join Date: Feb 2004
Location: Lansing, MI
Aquarium Pharmaceuticals makes a really good GH and KH test kit. Their pH tests aren't too hard to follow, either. Those are the three that you should test for the most, but it's good to have ammonia, nitrite, and nitrate handy (those are NH4, NO2, and NO3). AP tests are really easy to use, as well; it just takes about 10 minutes for the NH4 and NO2 to develop. I've never used the AP test for NO3; I only know the Tetra kits for that parameter, which seem to work well enough.
I have no experience with phosphate or iron test kits as I've never used them and haven't had issues with those nutrients in my tanks. If you're new to planted tanks and don't keep very demanding species, you probably don't need to worry about those two until you get more experience. Read up a little on their importance and decide if they're worth the investment at this point.