Hi buddy’s, please help me to find the problem…
This are my seedlings…and some old mother( i don’t know why I still keep hahah )
and I don’t know what problem they could have? In winter I had the same problem and I thought the roots are to cold. So I insulated the complete growbox. After that humidity and themp. are way better and I can control it easyer … but the plants are look the same…
I grow on coco and buffer that with cal/mag every time befor I’m using it again. So now I’m thinking that it could be some kind of iron deficiency or something like that?!
Or
Do you think it could be some kind of to much light maybe ? have changed my light an now 2 LED stripes von clauma with 5000K 18W 1200L
Pls help me… 
