Slight yellowing from centre new growth

[564xxl]

Hi all
Indoor grow
These 2 ladies 6 weeks old ladies have got a slight yellowing appearing and one has tip burn on new leaves
Coco / Perl 70/25 with circa 5 percent soil
Mills A B fed
Temp has been at 20

I think I overwatered and may be a bit cool

Opinions as I want to fix not exacerbate

Cheers

 

[Merkle]

Hi all
Indoor grow
These 2 ladies 6 weeks old ladies have got a slight yellowing appearing and one has tip burn on new leaves
Coco / Perl 70/25 with circa 5 percent soil
Mills A B fed
Temp has been at 20

I think I overwatered and may be a bit cool

Opinions as I want to fix not exacerbate

Cheers

Question. What does your feeding schedule entail? What nutes are you using? Have you measured your ppm in your h2o? How is your ph?