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Re: Potassium test...
>>From: "Christopher Coleman" <christopher.coleman at worldnet_att.net>
>>............Your potassium test has arrived! ..........
>I think I wrote that statement about the lack of any colored potassium
>complex about three years ago. I did hear mention of the tetraphenylborate
>method about two years ago on the APD. As I recall, the test described was
>not very accurate. It sounds like better tests have been developed.
Yes, that's true, I'm using the LA Motte Potassium test with their
spectrophometer (which is far cheaper than HACH) and it has always given
About the concentration, I would say that something around 10ppm K or more
is the average for aplanted tank with a lot of light.