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ok thats what im after it should change over night but as long as it lime green when co2 is on and light are on then it ok..Ive only used 4dkh water with bromo blue indicator solution, You can buy it premixed at aqua essentials (easiest way to do it) It starts blue when no co2, goes green when right co2 and then yellow when too much co2.
you want it to be green when the lights come on, so start it a couple of hours before lights on, then you can turn the gas off an hour before lights off. no idea what colour it changes to over night as its dark lol, at a guess somewhere between blue and green