K-train is absolutely right.....your ph is way off.

Kron, the amount of energy you put into your plants will be exactly reflected in how well your plants grow in hydro. If you count on luck to correct your ph then no wonder your plants look like that. You need to put your ph at 5.6-6.2 and KEEP IT THERE Does that mean you have to check and adjust six or seven times a day? Possibly. You can't get away with doing things once in awhile and grow healthy plants.

That's a fairly nice sized plant so it obviously was growing well at one point.
What the hell happened?