leaves turning yellow,white HELP NEEDED

[BUDBHOY]

Hi i just started using coco coir i,m using vitalink coir grow & bloom cannazym,hygrozyme & B52 in veg as i havent reached the bloom room yet i,ve noticed on some plants mostly seedlings that my leaves are going yellow then white almost with slight brown dots blotches at the tips any help appreciated i usually use cellmax & hydroton but wanted to try the coco-coir out any help tips well appreciated like i say some look okay others definately don,t Respect Growers p.s i can forward pics if needed thanks

 

[SciFi]

Umm.. I've read coco can buffer some minerals and nutes. I think it was cal/mag and nitrogen maybe?

It's hard to say thou.. post some pics, and PH readings, temps, etc.