m0useanswered grow question 3 years ago Did water get on the leaves and they burned a bit?
does not look like anything crazy just yet.
As for PH your diary is saying 6.2 most weeks, if this is the plant in that diary.
In coir on hydro grow I would not expect that to grow so well in 6.2 but its looking alright.
Keep an eye on it, might just be a small isolated event.