Change the water every other week and add two drops of 20-20-20 in liquid with Hormex, a growing hormone for every tree, arbust, ornamentals and others. Two drops of Hormex. All mixed in water. Good Luck

lucky bamboo are indoor plants so you need not be so concerned about the light, partial light will suffice. but it appears that the plant is lacking in some nutrients e.g nitrogen or phosphorus. check with your nursery on advice on liquid fertilizers for this plant.

I have heard that lucky bamboos only thrive when they are given as a gift. if you purchased the bamboo then may I suggest you give to someone else.

Feed it a liquid plant food and a drop of super thrive mixture. It will come back in about 2 to 3 weeks.