I've never used it, I've only had my tank set up for a week, but I've heard the Freshwater Master Test Kit is really good. In fact, that is what my LFS uses. I didn't buy from my LFS since they sell it for $35, and my local Walmart doesn't carry it. So I ordered it online from Big Al's and it should be here Friday.
Good luck, hopefully yours has it.
Good luck, hopefully yours has it.
