well, because no one else has bothered, I will... We need way more info than that.
Ph of water
Ph of grow medium
Soil/ or hydro
how often your watering
do you have any pests/bugs
If you can answer some of these questions, as well as post a picture you might get some help, otherwise its just a stab in the dark.
They are gdp clones so I'm told in coco. I'm using canna coco nutes. Ph about 5.5 to 6. Temp from 77 to 80. They are about 3 weeks since roots show. They are under a 600 watt running on 75 percent. I'm hand watering at the moment once a day.