[searchingforit]

Not all plants are showing this but a few are. They are under LED. Fed 6/9 + 1g epsom salt twice a day as they are in small pots. I have been chasing this deficiency since they were smaller. I tried scaling feeding back on the problem plants from 1.2 EC to .9 and worked up - same problem. Dark veins, interveinal chlorosis then these brown edges form with downward hooking. Growth is not right. Temps @ 80, RH 65%. RO mixed with tap for stability pHed to 5.8. Roots look great.

[RubeGoldberg]

6/9 is a dogshit formula for coco. Buy a real cal/mag and also buy the bloom bottle.

you're "chasing" what you're not feeding.

[Elmer Bud]

G `day SFI

Flush and test the EC and PH .
Some thing is not right .

What brand coco are you using ? Did you flush it before you used it . Is it pre buffered ?If it was a brick . Did you pre charge it with calcium to buffer it ?

Thanks for sharin

EB .

[searchingforit]

Originally Posted by Elmer Bud

G `day SFI

Flush and test the EC and PH .
Some thing is not right .

What brand coco are you using ? Did you flush it before you used it . Is it pre buffered ?If it was a brick . Did you pre charge it with calcium to buffer it ?

Thanks for sharin

EB .

It is good quality coco. I went from half strength 6/9 with 1g epsom to full strength. Pre-charged or not wouldn't make a difference at this stage as it is DTW and they are watered a lot with that solution. Some plants are exploding in perfect growth while a few look like that. A lot of people have had success with 6/9 so I'm trying to ride it out but environment is on point.

[searchingforit]

I also added cal/mag at half strength as I first thought it was magnesium def. Made no difference for these few plants nor does epsom salt. New growth is good then that happens when they become 3rd set from top or lower.

[Elmer Bud]

G `day SFI

Epsom Salts is Magnesium Sulphate .
Your nutes will have some both in different forms . Then adding Cal Mag your doubling up on nutes again .

Drop the Epsom Salts and foliar the cal mag if you have to use it .

Thanks for sharin

EB .

[Bush Dr]

Try feeding 6/9 at full strength and ph 6.0, they look pale

[Absolem]

H3ad used the 6/9 with very low ppm water containing little to no calcium. He was basically using RO water.

This is a long post I wrote comparing the 6/9 to Canna. Might answer some of your questions. It's post number 16.

https://www.icmag.com/ic/showthread.php?t=278914&page=2

[searchingforit]

Originally Posted by Absolem

H3ad used the 6/9 with very low ppm water containing little to no calcium. He was basically using RO water.

This is a long post I wrote comparing the 6/9 to Canna. Might answer some of your questions. It's post number 16.

https://www.icmag.com/ic/showthread.php?t=278914&page=2

Thank you. I am using RO and tap at a ratio of 3 to 1. I use this to maintain a steady 5.8-6.0 pH. My tap water has has very low calcium, MG as is. Tested @ 21 ppm calcium, 4 ppm Magnesium and much less with my ratio of tap to RO. I am barely adding any calcium/mg.

These plants do look pale. The calmag experiment was done when this deficiency was underway then stopped as it did absolutely nothing positive. Out of 8 plants 3 show these symptoms while 5 look perfect. I will not feed under 6/9 and see if there is an improvement. New growth is fine then this appears below the new growth.

[searchingforit]

Originally Posted by Absolem

H3ad used the 6/9 with very low ppm water containing little to no calcium. He was basically using RO water.

This is a long post I wrote comparing the 6/9 to Canna. Might answer some of your questions. It's post number 16.

https://www.icmag.com/ic/showthread.php?t=278914&page=2

Do you think 6/9 without the 1g of epsom is best? mg and S seem a tad low without it but it is also a 3:1 ca/mg ratio with no epsom added.