In my tank i have noticed something very odd! It might be normal, But im not sure, Plants open and close i know, But my lights come on at 2 and go off 7 hours laters at 9pm, But...By 7 the plants have closed. I also have noticed that the plants tend to open at about 10 in the morn even when lights are off. Is this when the photoperiod starts and begins? If so my plants truly o have a routine! And if this is double true would anyone agree with me that introduceing the co2 within the time tht the plants are open is best! Just an idea that came to me thats all, After ll we as humans dont eat when sleeping.