Possible nute burn or deficiency? im not sure?

It started with the older fan leaves on the bottom and is now on about 4 of them. Hasn't effected any new growth yet. Other than possible stunting. Plant is about 3-4 weeks old, started in rockwool cube and growing in hydroton. I'm using dynagrow grow and protetk ppm 650 ph about 5.5-6.0. Been watering by hand about 3-4 times a day until there ready to go into bloom where I'll have my ebb n flo set up.

Pictures won't load, shitty ass fucking service is all I ever get here at home! Edges of leaves are turning a yellowish brown from the tips and is working it's way inward. Older effected leaves are showing slight brown spots over the yellowing like it's dying. Leaf stems turning slight purple.

Pictures would help.

There we go

Definitely burn

Sent from my LG-LS980 using Rollitup mobile app

I thought so, I was hoping it wasn't because it's the only one of six burning. It was a random bag seed, I guess I'll have to separate what I feed her then.

Yep it's actually pretty common that 2 different plants need different feeding regiments

Sent from my LG-LS980 using Rollitup mobile app