godzilla - You can dose at any time in the day, as your plants will use them day or night. The only possible exception to this is micros, which might be best dosed in the morning (or at the beginning of your photo period)... Just the same, I prefer to dose in the morning, if I remember.
SparKy697 - The idea is you don't want anything to bottom out, so you are dosing each thing roughly every-other-day in higher quantity than your plants are likely using them up in that period of time. Once you get your tank within the desired ranges to start with, then you are only compensating for what your plants use, or your bacteria is eating up, etc.... HTH