I use a combo of Tetra and Aquarium Pharmaceuticals.
Ammonia: AP
Nitrite: AP
Nitrate: Tetra
pH: AP
KH/GH: Either.
I usually see the Tetra master kit for $21 and the AP kit for $28, but the Tetra kit doesn't include NO3, which usually adds another $10 or so. I don't really like the AP NO3, though, so.. I guess I'm just strange!
