There's some purple hue thing going on, think...

Looks like its normal i just would wait and maybe lower the ph a bit (5.5 - 5,8ph) . Some strains get/are purple/viloet/red/black or whatever (ww not really 😅). In the other hand plants turn purple at flower stage if the night temps drop (depends on strain how low, but in my experience normaly at about 15C° and strain which like it warm already starts sometimes at 20C°. Your PH can you geh down with a good ph down product. Take water, check ph, add ph down if necessary and mix it, wait some time and check ph again. Do it till your ph fits. (Ps the wait Time after adding ph down befor checking ph is important, so everything geh really mixed.) I use lemon juice to get my ph down, but im growing on soil and i dont know if lemon juice keep the ph stabil with hydro. Good luck ✌️