Leaf edges

Just plain water for a few weeks and make sure your light is 24in from the canopy

Yeah - this is nute burn, an excess of nitrogen. Since you don't have a diary, it's difficult to tell you very specifically what we think you should do but in general, knock back on your grow nutes as they contain the most nitrogen. If you don't have a PH pen, invest in one (best thing I've bought for my grows - bar none)... keep the PH of whatever you give her (water/nutes) between 6.0 and 6.5 and when you water, make sure you're giving enough water so you have 10-20% runoff - this helps flush the soil just a bit to prevent lockout. Test that runoff water to see what the PH of it is... if it's way off the charts, you'd need to do a flush and start your nute program over but at about half strength for the first feeding (after she dries from the flush). More than that, I have nothing else to offer... except a plea to start a diary on this grow - even if you start it from this date and go forward... we'll have a lot more information if other problems/questions come up. Good luck!

The "Claw" that you see with the fingers of hte leaves going down is a sign of nitrogen toxicity, Burnt tips can be from either to much or even to little. My guess would be you are correct with excess nutrients. As for what to do cant say. We would need to know what nutrients your using and how much, how often do you water and when you water are you watering until you get runoff? Do you have an EC/PPM pen and if so whats the EC going in and the runoff ec. Do you PH your water and if so what PH. what are you growing in.