Pic Inside - Starting to yellow on the edges - What am I doing Wrong?

[Fattyboomba]

Hi Everyone,

Im currently having a little trouble.

Growing GG#4 photoperiods from seed and before I repot them I want
to nail the nutrients. They seem to be changing colors on the edges of
the leaves.

See pic here https://photos.app.goo.gl/wgMC8EFjqPjYDhZx9

Any advice or questions?

 

[LoveGrowingIt]

Any advice or questions?

You can post pictures here.

I couldn't see the leaves in the picture very well. Yellowing and dying of leave edges usually indicates a potassium deficiency. What are you feeding them?