Light stress?? Please help diagnose my plant issues!

[greenman12345676543]

Hey all, at my wits end with trying to figure out what is wrong with my ladies any help or advice would be massively appreciated

Im running Athena nutrients, two feeds a day in 3 gallon pots with 10-15% run off

Ph is 6~ and 3 EC (as per Athena guidelines) while run off is coming out at 3.5-4.2 EC and ph is 5.7-6

LED lights are roughly a foot above the canopy

It started with the tips of the fan leaves going yellow and turning upwards and slowly progressing throughout the rest of the leaf. My environment is about spot on (I think) 25 degrees Celsius/ 77 F, with the humidity at 51~

They are at the start of week 3 and the yellowing is progressively getting worse

Cheers

[greenman12345676543]

Forgot to mention im using coco perlite mix 70/30

[9fingerleafs]

To me it looks like you have two issues. The yellow tips curling upwards it's because the EC you are watering with is too high. I don't recommend going above 2 with each watering. The second issue is magnesium deficiency and could probable be due to the excess of other nutrients or maybe just need more magnesium.

Its going to start to show potassium deficiency in the next few weeks also. Don't know the ratios of your nutrients but I would reduce the nutrients in half, so 1.5ec and then add some epsom salt (look up the appropriate dose) and then maybe add some flower boost (mono potassium phosphate) once the leaves recover the inter venial discoloration

[OldManGrower]

I believe that you PH is too low. Go to 6.5. You do also have some light stress, Raise your light or lower the intensity.

[Sixwinds]

I grow in coco/perlite and the best PH practice is to vary from 6.5 to about 5.9. Some nutes only get picked up on the higher range and some only on the lower. If you give high one feeding and low the next all bases are covered.

[Bluey]

That's a pretty big spread. Plant can get everything in a coco grow it needs to 6.20, 6.25 to be safe if you've got an accurate pH meter.