and alkalinity are the same.
Yes... that kit will test for alkalinity just fine.
, from my understanding, that's just the freshwater equivalent to KH
. If you wanted to know if your tap water was soft or hard, you'd use the GH
test is good to have, but not required if you're not doing corals right away or have anything that requires calcium. In my opinion, it's still a good thing to know.
Magnesium testing isn't really required, unless you're dealing with Ca
issues. Low levels of magnesium can effect your Ca
levels. However, with normal PWCs you should never really have to worry about Magnesium levels. I'd probably put off the Mg
test kit unless you're anal like me and want to know exactly what the parameters of your water are.