Im Stumped!

Hi everyone,
I'm 4 weeks into flowering my dwc plant. All my fan leaves are gone. The buds are still growing but the lower leaves are turning yellow/ brown and getting skinny. My PH is alternating as well as my PPM's (in 24 hrs, went from 278 to 320). Would nutrient lockout or salt build up cause this? I know the fan leaves provide vital sugars, am i fcked without these? The only thing i can think of is to flush with 3 gals of Ph'd water and a drop or to of superthrive. I appreciate any info. Peace!

what do you have light watt sq ft ,do you have good air stones, does water smell foul,what was happening before leaves droped did tips burn, curl ,roots brown need more info l will try to help best thing is empty res fill up new one mix every thing normal and couple drops superthive,type supp.,

pic's help but the fans die off during flower.

Thanks for the reply,
I have a CFl lamp 210 watt 22,000 or 24.000 lumens (Sunleaves Satellite 2), the light's real low heat, I usually leave the light on when changing a bulb. I've used it before so i know what the outcome will be (nothing special). The airstones are old but still seem to be kicken the same amount of air. I regularly change the res (every 2 weeks). The water is clean with no smell, discoloration or rusting on the inside. The roots are an off white but not yellow however they seem to be clumped together. The leaf tips did burn but within 3 days the whole fan leaf turned yellow/ brown then shrunk to resemble thin gnarled fingers. I'm currently flushing with plain ph'd water and SThrive. The last time i grew ws abt 5 years ago and before i buy new lights i kinda want to get the education process down. Would nutrient lockout explain the ph and ppm fluctuation? Thanks.

Stumps: Ya, i need to buy a dig camera. Oh... so it's normal for all the fan leaves to die off. Ok.

well not all at one time. as the plant uses the nutes in them they die off.

Hey, just checked one of my clones and the roots completely encompassed the airstones. Is this an inevitable issue? I jst gently removed the stones.

I think given time the roots will fill the res.

Ur right, sorry dumb question.