I'm not really sure what you mean by carbon use? Do you mean active charcoal carbon? The test kit is from Red Sea, it tests for alkalinity and PH. I always thought it was a great product, simple to use. For the alkalinity the test shows me a colour green which means normal Alk. Also not all of the coral is dull. A majority are. Like I said before the one coral (brain coral) I bought at the LFS was a beautiful white with yellow center, now it's a dull brown with green center. And the Padodia was a yellow colour and now it's a light green. The Zoas of one species was a dark yellow and now it's a dull tan. How and why do they change colour like that drastic?
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