I would like to know if this is true or not. Someone said that if you have your lights on for no more than 5 hours, then off for an hour or two, then back on for 5 or whatever, that algae won't grow because they need more than 5 hours of light in a row in order to multiply. This kind of sounds iffy to me but I don't understand the differences between algae and plants enough to know if it's bunk. Can anyone else answer this?