i like to increase my lights 30-50 PPFD at a time instead of larger amounts the plant seems to handle it better (could just be a me thing) but you should be good there & give it a week before you bump up the light intensity again, 60cm away from the seedlings how close is the light from your bigger photo period? might want to check how much heat you're getting on it, palm down at plant height if it feels to warm raise your light & readjust PPFD, i like my lights atleast 20" from the tallest pointyes i want to give her a chance if she continiu to grow so slow i will take it out will give her 1 more week. about lights i got a question i have at the moment around 300-330ppfd light on the small plants distance from light 60cm and the big one recive like 550-570 in the center and like 450 on some low branches and those numbers was little lower i did increased it to this numbers 30 min ago should i go anyhigher ?