Testing time??

[reefkeeper135]

Is there a prefered time to do your water tests? Will the readings be different first thing in the morning versus after the lights have been all day?

[tecoral]

Generally the only big fluctuations will be with your PH, it will drop during lights out due to a build up of CO2 as photosynthesis has stopped, limiting O2 production. All other typical parameters we test for should remain fairly constant.

[reefkeeper135]

OK was just curious since I leave for work at 5:30am and always test late at night after work.