I have been using the reef foundation test kits and supplements for a month now.
I have found the Mg and Ca tests to be very consistent and easy to spot the end point. However I'm slightly confused with the Alk test. Although its the quickest one to do involving the least reagents I've found it very hard to spot the end point as it isn't as clear as the other two.
From the start, before I bought the kit I watched the videos on YouTube for all 3 tests. On the Alk test video the guy says that the end colour to look for is pink however the colour he shows as the result doesn't look pink but more dark purple/grape. And on top of that the colour on the card is peach! lol
So what I've been doing is ignoring the card, and going for the grape colour on the video.
Has anybody else had the same problem? Should I be aiming for the colour on the card? There's the question of whether my results are accurate or not which is concerning me now.