That is classic nute burn right there. That, and classic poor camera skills.
See how the tips of the leaves get really skinny at the end and the tips are yellow and brown (the techincal term is necrotic). That is a classic sign of over fertilization. I don't see any signs of leaf curling that are too bad.
You may be a little high on the nitrogen side.. as I stated earlier, that can cause the claw.
I would give them a nice flush. I'm not captain soil guy by any means but I believe the recommned flush is about 4 times the volume of your container... someone can confirm that for me.
If you have a PPM pen... which you should... measure the PPM of the run off and post it up.
But at least now you know, you overfed them. It happens sooooo much. In the future, cut the nutrient additions by a 1/3 or so. or even a half. It is ALWAYS better, always always always, to under feed a plant and then bump it up when you see a deficiency, than to overfeed them. This is ESPECIALLY important for those that don't have tight climate controls and things can get hot and dry and the plants need to transpire allot.
What if you were standing out in the blazzing sun all day, sweating your balls off and then a guy comes over and hands you a tall glass of salt water..... your tips would burn too.