Looks like overwatering with the leaves that are curled down. I doubt the light is too close, unless you just changed it recently, as the plant is stretched like crazy. If you haven't recently changed the light or moved the light closer I would do so. In soil, you shouldn't really be feeding at this point but you should be phing the water to 6.0-6.5. If you haven't been phing at all you should definitely start to do so as it will solve a lot of problems. Also, you generally don't need to mist the leaves of the plant. If your humidity is low you should make a humidity dome out of a 2-liter soda bottle.