Help diagnose !

ok so ill let the pictures do the explaining, i have some yellowing issues.

the biggest is pilav, doing very well. the others are gods gift from seed and were germinated in rapid rooter plugs then put into the cups with botanicare cocogro. all plants are in coco.

pilav has gotten botanicare veg and karma the last few days, while the others are way to young to add nutes.

i noticed a white discoloring of the rapid rooter plugs and have a feeling it might be mold.

plants get 26,000 lumens of fluorescent which stays with 5 inches of plants. i don't water until the coco feels dry. i water with osmosis (havent tested for ph these plants are going to be moved outside as soon as their healthy, but this could be a ph issue? 20 seeds i germd before these turned out fine, in the same exact setup - coco, same water, lights, etc)

help please!

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hope the pictures help,

thanks in advance

anyone?

the leaves are much more yellow then in the pictures. 2 are yellow 2 are nice and green

heat stress? my cabs seem quite cool enough with 2 large comp fans intaking 2 smaller comp fans exhausting...

im thinking it has to do with lack of nutrients in the coco...

heeeelp :)

ok how about, how soon do i need to add calmag? i know I need it, but I thought it wasn't until they were past seedlings..?

Add calmag RIGHT AWAY, a bit weak of course since they are seedlings. Coco is weird like that. Also, try to keep it just a hair moist at all times. Next transplant, add some perlite to the coco and that will make your life easier. Coco fibre scavenges calcium and it is imperative that you use a supplement.

thank you stinky :jointsmile:

Stinky: does a coco medium run at a lower ph?

ok look at god's gift today. it went a couple days w/o the calmag and the lower leaves well.. check it out. i hope its only def was the cal/mag, but i plan on picking up a micronute in the next couple days. what does this look like to everyone?


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Definitely starved, and possibly overwatered. Get goin on your calmag, chop chop!
Yup, coco should be treated as a soilless medium and run around 6.4.