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Red Sea does have great videos on their site. I would start with those. There are specific end colors to look for, they will change slightly when they get close but it’s that final color you look for. People like me, who have issues as well, use other tests like the Hanna checkers which are much simpler to useThe one test says to keep adding drops until it turns, pink I think, but it doesn't say what to do or what the color means???