Test kit conundrum's

[monocus]

your second test should stay the same.all you have to do is do the first part of the test and subtract 6 or 8 depending on what your reading was,and also do half measurements of the first part and multiply it by 2

[Proteus]

I use Elos ca and kh. But mg I like Red Sea. Still a little complicated but not as much as Elos