hi Nemmba, defo buds forming there dude.....nice:bigjoint:. looks like a wee bit nute burn tho, i'd prob cut back with nute strength for a week or so pal:lol:
also check that only roots are in the water, none of rockwool should be submerged. this can cause similar looking symptoms, good luck...i went back to soil after succuming to similar problems
totally agree with massah on this, temp of nutes tank being too high can cause browning of roots causing pithium presence in water which attacks plant in way displayed in your pics