I have recently got it into planted aquariums I bought a CO2 setup and a drop Checker which came in today now it says I mix five drops of the solution with 5ml tank water but I've watched some of the other YouTube videos it says not to mix it like that also it didn't come with any instructions that tells me how long the test should take whether it's minutes or hours or how long that solution last is it just that one measurement throughout the day or just that one time. Please help