ok...my plants are 19 days in veg but i have a litlle problem with one plant .

tempt are ok, humidity also , runoff ph 6.8 .

i never added fertilizer in soil .

here is picture . the problem is that new leaves are yellow at the edges and they just a litlle bit curling also at the edges .

lower (older ) leaves are perfect green without a problem .

i think that is deficiency of mikronutrients , maybe iron , zn, mg .

is this possible ?

any advice is very welcome . thanks for help .

peace .