yellowing tops

hey guys i arrived home from work and saw my plant was yellowing on the tops more than normal i repotted in a larger pot and made new nutrient mix slightly weaker than normal im using biobizz biobloom and using 2 600 watt hps lights should i be worried i kno the fan leaves yellow later in flowering but this is takin the biscuit

it may be just the rootmass had got to large and its not holding the nutrients it needed any help is apreciated peace to all thanks for ur replies

Looks like a PH problem.. LOOKS like the plant is having issues absorbing nutrients...

yeh i flushed with regular water thinking it was over fertilisation it was fine until i got a ph meter and ph down from my mate n started using that now its got probs is it irreversable do you think? il just stick to using non ph adjusted water from now on

https://www.rollitup.org/indoor-growing/40269-biggest-single-indoor-plant-ever.html#post422987

there not yellow anymore thanks guys have a look =)