g'day mark,
yes try the repotting as has been suggested, add some aquarium charcoal in the bottom this will help keep the water fresher.
also as has been said it is not "bamboo" in any shape or form, and a plant that normally survives in soil, being kept as a water culture feature inside is at all sorts of disadvantages.
also another issues could be your humidity in the house may be too dry, so aprt from giving it a misting say every couple of weeks through the growing season with a liquid fertiliser mixed at about 1/4 recommended rate, you my have to increase humidity and one way is to mist spray the plant at least once a day and more if needed, or the bathroom may be better suited?
air conditioners and central heating also affect indoor plants.
and whilst direct sunlight is not desired they still need good alround light for the health of the plant.
try repott snipped With peace and brightest of blessings,
len & bev
-- "Be Content With What You Have And May You Find Serenity and Tranquillity In A World That You May Not Understand."
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