premature yellowing on white widow and thc big bomb at the beginning of week 6 flower

Hi, I am brand new to this, I have never even grown a tomato before so please excuse my ignorance in advance. O.k. so I am growing in 5 gallon plastic buckets using roots organic greenfields green light soil. In the beginning I was told by my local grow shop to use regular greenfields soil and initially burned my girls. I then read on this forum how to fix them and they thrived. I am hoping to repeat that. So besides the soil I fed them nothing but perfectly ph'd water (15 ppm) every time ranging between 6.7 and 6.9 to make sure they had a variation to uptake a better range of nutes. I check runoff ph at every watering. Two weeks into flowering I started using a 1/4 teaspoon per gallon of Connisuer nutrients by advanced nutrients hovering around 550 ppm. They were all doing great until the start of the fifth week in flower when all of the sudden some started yellowing and the leaves died off. Not just on the bottom few leaves but all the way up. It hasn't affeced the leaves closest to the buds but it is getting there. I then added cal mag to the feedings. And then in the past few days some of the leaves have looked burnt. I nute them for 2 weeks and then give a full flush. I have just flushed them and they got worse so I doubt lockout is the answer. It could be under nuting but I am two weeks from harvest and was about to begin flushing them. So my question is does anyone have any clues as to why they are yellowing so early? And should I give nutrients for my next feeding or just flush and chop before they get worse. I am not sure if the crystals are milky or clear but the hairs are 50% red. Oh before I forget my room temps range between 75 and 85. I am running 8x 1000 watt hps mh in the beginning. For the first three weeks of flowering I had the ballast ranging between 600 and 750 depending on the time of day. I have a dehumidifier constantly running and two 8500 btu air conditioners cooling and dehumidifyiers running all the time too but have trouble getting the humidity to 45. It normally hovers at 55-60. So my other question is am I doing things right? Just.looking for advice and feedback. Sorry if its too much info but I always here people say they need more info. Thanks for any help in advance. Here is a video on you tube of the girls. The light makes the yellowing a little tough to see. http://www.youtube.com/watch?v=7GFuwIPOOPw&noredirect=1

6 weeks in flower I wouldn't worry to much about yellowing leafs.

topfuel29 said:

6 weeks in flower I wouldn't worry to much about yellowing leafs.

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Thanks for the quick reply bro.
Normally I wouldnt worry but like I said it started in week 5, the thc is a 7-10 week strain and the rhino is 8-10 so it just seems really early for how advanced it is. in one week 80 percent of the leaves on my best ladies were banana yellow. The leaves are falling out like crazy. On the bigger ones it feels like if it keeps going this waythey won't have any fan leaves except the ones closest to the bud sites left before I can give them a proper 2 week flush. And on top of that when I water, the fan leaves used to perk up and reach for the sky like crazy hours after every wateeing. Now they just look kind of lazy. Is that normal? I water with 1 gallon per plant ( with a 1/2 tablespoon Connisuer and calmag) every three days and flush with pure 6.8 water every third feeding. I doubt they are overwatered because I wait til the pot it fairly light and dont let them dry til they droop. But now the lazy fuckers always sort of droop. It could be normal but like I said I am completely brand new to this and dont wanna mess it up. I have spent almost 2000 on lights and almost as much for the damn electric bill. I just dont wanna pull them prematurely or let them sit to long and produce unsmokable stuff. I am thinking about giving them my tap water which is from a well and purified to 145 ppm with no chemicals and a 1/2 tablespoon Connisuer to see if they regain any color. If not I will flush for a week then chop. Does that sound good? Any help would be very useful and thanks for the reply.

Here are some recent pics. the leaves are mostly yellow. I am gonna water with 125 ppm well water. It's a little hard but I;m hoping iy will give an added boost of natural nutrients. I am gonna add 1 teaspoon connisuer nutrient unless I am advised otherwise. Any hekp is greatly aappreciated. I will be watering in 3 and a half hours.