[howdy20012002]

hey there
sorry about that..I answered in a hurry and on my Iphone
what I meant to say is....
I personally like the salifert Copper test and I find it to be the most accurate
I have gone through 3 API testkits and I have yet to get any reading that even looks close to what the reference cards shows.
I have used seachem and still do, but have had issues with a couple where they weren't showing what they were supposed to show.
I can't really comment on the others because I haven't used them.
so, salifert would be my first choice
seachem second
however, with any of them, if you do get a reading is not enough close enough to what you think, definitely retest.
I would personally buy 2 tests kits and test with both just to make sure.
copper, although very effective at killing parasites, can be just as effective killing your fish if the dose is too high.
let me know if you have any more questions.