looks like she might be a tad overfed or possible ph swings??
the burnt leaf tips are a dead give away
when was the last time you changed your rez??
and secondly when was the last time you CLEANED the bucket??
Could be over feeding I guess. I change the rez ever Thursday morning, same time. I also clean out the bucket completely each time I change the rez, and pop it in the dishwasher every two weeks, so that bitch is definitely clean. She's also really close to the light at this point, but we're maxed out on height and she's not getting any taller, so I just try to position her so the light is kinda "beside" the tip top. But the airflow is good and it's definitely not hot up there so I may just be feeding her too much.