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About a month ago I installed a Red Sea CO2 Indicator (drop checker) in each of my three tanks being injected with CO2. Works like a dream. Just refilled with fresh solution today. I found that the manufacturer recommended amounts for the mix ended up being a bit hard to read, so I modified it slightly this month and it's much more readable.
Manufacturer Recommendation
1ml of tank water (obviously substitute chosen KH reference solution)
2 drops indicator solution
Modified mix
1.5ml of KH reference solution
4 drops indicator solution
You can just barely still get the indicator rotated after filling with this much solution. The results are a darker color that is easier to see without turning muddy.
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