Don't even know what you're growing here... autoflowers? Photoperiods? What nutes are you using? What's the PH? All we know is they're 25 days old which tells us exactly nothing! Can't help you with no information... do yourself (and us!) a favor - start a diary and then ask your question again... We really DO want to help!
With limited information it is hard to diagnose right. Looks like you have a lock out due to ph. If you are growing in coco your ph should be around 5.8. Soil 6 to 7 ph. Again hard to determine without proper information to diagnose.