Just wanted to mention that API has great costumer service. I bought a freshwater master test kit awhile back and didn't want to by the saltwater one (the same tests) for another $20 so I asked them if I could have the saltwater master test kit color card sent to me in the mail. They did it free of charge and I got the card 3 days after asking.
Money can't buy happiness.... But I can buy fish, which is kind of the same thing.