i have a master test kit from api but it doesnt have some test kits that i seen at lfs suck as kh gh&kh what are the key test to have other than the nitrite,nitrate,ph,amonia tests
This is true. The master kits come with all the common chemical tests for either fresh or saltwater "fish tanks". However I know with s/w, if you are keeping corals you will have to buy several other test kits because the perimeters of a reef tank are way different
When it comes to f/w I don't really know because I always had fish only tanks
so you may want to pay attention to water harndness.. i havnt really kept them yet but im sure it may be important. aside from that i think your fine with what you have.