Filling-out the troubleshooting form is the only way your plant's situation can be diagnosedgoing to get an accurate response...but with the 'canoeing' of the leaves...my initial thought is a ph issue. But it's not affecting the entire plant. If only on upper leaves, it's perhaps heat stress and overwatering combined.

Anyway...fill-out the troubleshooting form, and someone with hydro experience should be in shortly to help. :thumbsup: