Looking for some good advice please!

Hi boys and girls,

I'm half way through my fourth grow and thought I was pretty much there with all the basic knowledge I needed... but I can't really figure out whats going on with this absolute ball ache.

All 4 plants were popped from seed on the same day, vegged together, went to 12/12 together and have all received virtually identical feedings, waterings, tub sizes, pruning and light exposure.

All currently in 3rd week of flower (Day 19):

• Plant 1 (front left of the tent) is doing great
• Plant 2 (front right of the tent) is doing fine too but growing slower than plant 1
• Plant 3 (back left of the tent) is has barely started producing any pistols and the new growth looks all lanky and limp, generally unwell.
• Plant 4 (back right of the tent) Is just about producing very poor quality pre-flowers but still looks quite lanky and unwell.

Its plants 3 and 4 i'm worried about because if they go tits up I'll lose half of my hard earned yield!

Did a Ph run off check when watering today and the results were:
(Watering all plants at 6.7)

• Plant 1 run off @ 5.7
• Plant 2 run off @ 5.4
• Plant 3 run off @ 5.4
• Plant 4 run off @ 5.5

Equipment:

• 180w UFO led light
• 2 x 45w 2700K red spectrum CFL's
• 4 x 10l airpots
• Plagron light mix soil with 30% added perlite
• General hydroponics 3 part nutrient solutions (Grow, bloom & micro's)
• Additional CalMag, silica and unsulphered blackstrap molasses
• Currently doing a feed every other watering, set at 1050ppm's and poured till theres around 20-30% run off
• Day temps (lights off) around 23degs c, Night temps (lights on) around 27degs c (Cant get this any lower unfortunately)
• Humidity generally around 55 - 60%

I have a hunch it might be a Ph lockout issue so I'm going to set my next watering at 7.0 and see how the run off reads then, then maybe keep going up in 0.2 steps every watering till the run off reaches 6.5? I've attached some photo's for you guys to have a look at, see what you think and please let me know!!

Cheers

looks like your soil is a little acidic, you need to add some lime to your soil

Thanks bobtokes. I went and bought a load of garden lime this afternoon, gonna put a top dress over all of them and raise the feed Ph slightly, lets see what happens!

For some reason I can't look at your pics, but maybe move them around in your tent? Still do everything else as well but that would eliminate any room elements. Just a thought.

180 wall watts of led? I think I would want alot more light, have you flowered with this setup before? I use one 135 watt ufo to a plant, in a 3x3 3 lights, 3 plants. with cfl side lighting. Even more cfls will help