Burn or deficiency?

[Phatty]

This has been going on for alil over a week. The new growth started to get yellow tips and it just seems to be gettin worse. The yellowing has moved on to the lower leaves and branches and thats why i am so worried. I thought it may be a burn of some sort but the other plants havent showed any sign of it YET. They are all about 4 weeks old and in Happy Frog/perlite (3-1). I have not fed them anything except for one watering of 10ml/gal of Rhizotonic about a week ago. Also water with plain water, ph of 6.5, every 3 days.

 

[cindysadvocate]

I think 10ml/gal is a bit too much for your babies right now @ 4 weeks. Recently I overfed my Chronics that were 3 weeks old at 5ml/gal (In coco) because I forgot to cut the strength in half and they started out exactly like that before getting burnt tips.

I'd suggest a flush and feed at least half of what you are right now when you see they need it. Remember your soil already has nutrients in it.

 

[Roughrider]

Looks like the beginnings of a little nute burn. I don't know about a massive flush (now they are sad droopy babies) but if it were me, I'd clean water feed the next couple times. They'll bounce back fine.

 

[Cruzin]

I would flush them with some PH'd water once or twice and then adjust your nutes.