So my SFV is in veg state and I'm noticing that only the ones in hydroton look like this. The tips are beginning to yellow. I water 4 times a day. 6:20-6:40 pm , 12:20-12:40 am, 4:20-4:40 am, 10:20-10:40 am . Lights on at 6 pm and off at 12 pm. I have a 20 gallon resivoir, for nutrients I use...