Looks to me like it needs a little shot of nitrogen.....maybe someone else will confirm
because that's my answer when anything turns yellow - but I think I may be right this time.
so here is the week 10 update on the 2 gorilla glue's ran in to one problem with the bigger one
with a magnesium deficiency but add some calmag to her diet see what happens in a couple days
the little one is getting super thick passing its big sister
They will love you for the purge and clear out mate. nice and fresh for the roots to take a quick breather and reset.
You have some big ladies mate. great work