Well,,I did what I said I would do as far as parameters on kent reef salt. I dont have issues and havent had any since my first hundred gallon back in the mid 80s. Im fairly new to the forums but not to fish keeping. The book says one thing and thats fine....Im not having issues with it. All things I say are from my experiences and from the way I do things (which I dont tell everybody everything)..Best way to learn is to try it..I did and I believe its just as good as any other salt (IMHO). I bought all frags when I started my 29 nano and now I dont have room from the growth my corals have undergone. I havent used that test kit in over 6 months so Who knows if it is accurate. I dont use it since I do regular water changes....Anyways I have had good luck with it. Doesnt matter if you use it or not since the other brands are only 5 to 10 dollars more its not really an issue..If your happy with what your using dont change. Im certainly not trying to sell it to you.Well, kinda stable. At some point the parameters will kill corals. Like, 500 CA is pretty high, and is recommended not to get above 480. But, I would think if you got to much more above that, that you might have issues.