I have just filled my drop checker. I put two drops of the solution in, then filled with 4DKH solution until the bubble was half full. I read that the solution should be blue in colour BEFORE adding to the aquarium, but it shows green! So i added a third and then fourth drop of the blue stuff (as per the bottle which said i could add 2-4 drops, but it has stayed green.
Any advice as to why it is green and how to make it blue?
Any advice as to why it is green and how to make it blue?