Obesity due to overfeeding is a common problem in captive reptiles.
Breastfeeding can be done on an "as needed" basis, but formula must be executed at specific intervals to prevent overfeeding.
Contrary to past beliefs, it has been found that not only do babies not need solid foods before then, introducing solids too early may lead to food allergies or overfeeding.
Avoid overfeeding the infant or feeding too quickly.
So, overfeeding your lucky bamboo could be the cause of your algae problem.