^ Yes. I also feed up to 6x a day but only during the lights-on period. I let the pots dry out a little when it's dark and start feeding again about 15 minutes before the lights go on. The last feed is usually about two hours before lights off, so around 14 hours of no irrigation, and then irrigate every two hours during lights on. The first feed when the lights come on will not produce much, if any runoff (as the pots are drier), but after the second and third feeds and so on you will see an increasing amount of runoff and you need to aim for about 10-20% total, as above. You should never let your pots totally dry out in coco. The reason you don't feed during the night is the plants don't use as much water and the pots shouldn't dry out that much. When you have a lot of runoff you can also run a higher EC, as the pots self-flush. Normally you run a slightly higher EC in winter (when its colder) than in summer, depending on how you comtrol your climate.