how much do you water your plant a day? the plant will absorb all of the water you provide it which is why its important to be careful and not drown it. make sure the soil you are using is not very acidic you want the ph level around 6. the acidic soil could poison the water the plant is getting and shock its growth. also make sure the water your giving it is room temperature or look warm, cold water will also shock it. the tips of some of the leaves are drooping possibly for a lack of water circulation throughout the plant. try misting water directly onto the plant leaves, the leaves will obsorb the water and is a more direct watering system. also you said the light above the head of the plant is about 4 inches away. you want it no taller than 2 inches.