demonmagus
spamming my way to the top...
Which test kit do you use, and where can you buy them, I'm a bit confused about which one to get as there are so many! 
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Saliferts are excellent...they are the Merceds Benz of test kits, but, cost similarly. Aquarium Pharmaceuticals (API) are quite satisfactory and that's what I use. I use Salifert for the more difficult tests (Mg, eg). SH