I have Ammonia and Nitrite test kits for my new tank set up and have noticed there are a wide range of other tests available... do I need a PH test kit as well? What about all the other tests available... it'll cost a fortune! Thanks
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IMHO
the basic kits everyone needs are
ammonia, nitrIte, nitrAte and pH
others that maybe useful are
kH (this buffers your pH, so it is handy to know)
gH (hardness)
specialist tests are
CO2 (carbon dioxide)
O2 (oxygen)
FE (iron)
PO4 (phosphate)
Cl/Cl2 (chlorine/chloramine)
Cu (copper)
Ca (calcium) [salt water]
Mg (magnesium) [salt water]