Plant problem please help

[Buckethat]

Hello guys! One of my plant the northern light is having some problems what is this? I water with ph around 6,0-6,3 and i have fed nutes two times not excessive ammounts so i dont know what this is, its my first time growing please help

[MeEasy]

Can't tell with purple picture and will need more info like soil ph and type how often you water and maybe more but that's a good start

[Buckethat]

I have coco coir with perlite and maybe 20% organic soil, i try to water with 3 days intervall, i have not tested soil ph but should be around 6 according to one of my meters thats in another pot

[SoOrbudgal]

Looks like green algae mold on top

[MeEasy]

Is that green in your perlite possibly moss?

[Buckethat]

No its just lefovers from defoliation that i didnt pick upp

[JDU]

You'll wanna pick that up so it don't mold.

[MeEasy]

I asked because I know coco holds allot of moisture saw the green. I don't have experience with coco though but I have read that you have to feed it like hydro because coco has no nutrients in it. My guess is a calcium deficiency because of the spotty coloring of the leaves but again I'm not experienced in coco so I should step out and let someone else help you out. I don't want to hurt your girls with bad guess