Join Date: Jan 2006
Location: Cherry Hill, NJ
Most of the macro nutrients are absorbed most during the day time, so early morning is probably theoretically the best time. I agree with The Trigger though, I don't think it matters much in our tanks, we are talking about small differences in an unlimiting nutrient environment.
Also, gluteraldehyde is not a nutrient. It also has a half life of 7-8 hours and will be gone within a day no matter what time you dose it.