Sick plant - please help.

PH of your soil?... phosphorus deficiency? Hard to tell from the pic...they look good, a little stretched between the nodes, this in purpose? more info = more insight

i didnt think it was ph at first, cuz i bought one of those over-priced meters, but now that you mention it, it looks to be the case. magnesium lockout maybe? how would i fix this? should i flush the soil out with balanced water? or just make sure its right on from now on? the spacing was not intentional. they arent all like that.

What kind of nutes? Off the shelf or homemade? Magnesium deficiency is possible, though I might expect more than the odd few to appear deficient if that where the case, double check the balance before and after watering, and on the nutes your giving them.

what nutrients are you using, looks like you make have overdone the pk booster too early and caused some lockout issues, or your missing your pk values all together, my first tip would be to start your growing experience smaller and learn why/what you are doing for the plant. honestly i have buds twice that size and density off a 600 watter. also watch your veg times/pruning techniuques those plants are huge and leggy as hell

Next time run the 600w MH from day one until 2nd week of flower. Can you please tell me how big is your space your growing in how close are your lights what's the temperature and humidity like also if them plants are as tall i would of used bigger pots or used coco there lanky as hell buddy and don't look like they have much rot room have you got a inlet and outlet and you useing a fan

temp has been 75-80 , humidity fluctuates between 40 and 50% 16inch oscillating fan, exhaust in in the ceiling, passive intake of house air. had a 600w mh on them for veg, added a 1000whps for flower. room is 12x12 feet.lights are about 3 feet from shortest plant. i plan to grow shorter plants in the future. this is my first indoor grow. total noob (but ive read a SHITload about it) im currently trying for a perpetual harvest. i drop seeds every week. anyway, any idea how/if i can correct the problem? these buds seem pretty small for their age. ill be doing this for a living so feel free to teach me how to get them fatter!

first thing first i would suggest doing a soil slurry test and check and see what your ppms, and pH are at in your soil

no EC meter. would flushing the soil with distilled water be sufficient?

wife got wrong water from the store. *facepalm* cant do slurry till i get distilled, correct?

so anyway, after more research, shitloads of soil tests, recalibrating my pen, doing more soil tests. etc. the water with nutes goin in is 6.8 the soil? 6.8 EVERY time. this is effin weird. looks like nute lockout hardcore. but it cant be. can it? did foliar feeding, have kept on schedule and they are just lookin like shit., yellow leaves with green veins (mag def right?) started gettin light brown crusty spot down the middle,(ph?) curling drooping leaves etc. the only thing i can think of that would be makin my bitches so unhappy is the lava rocks i put in the bottom. (wont ever do that again) anyway thanks for the help guys. hopefully next round will be a bit better.