you should post a pic and somebody will help. there is also a dedicated forum for the "lucky bamboo." I am reading the last part right? no night cycle? day in sun and night in fluorescent?

Nope, I don't put them in sunlight as the sun here would probably burn it.

I guess my question is why light at night? Also, these are not aquatic plants so don't be afraid to pot the remaining stalks and be done with the water all together. This past summer I moved mine to a traditional type potting soil and then eventually to this "semi-hydro" kind of deal. So they are still constantly moist.

Welcome to GW.

Most of the chemicals in tap water can't evaporate, so that could be part of the issue. No idea how your country purifies water, but ground water picks up minerals as well as whatever humans might add. Do you think the roots getting damaged as they go in/out of the water and rocks weekly? They don't look very long, or plentiful.

I was also curious about why one would put a plant under lights at night? Although the sun may not be shining right on it during the day, light coming in from the windows is usually enough to keep a plant like this alive. When I do put my plant outside, I make sure it is in a spot that is shady all of the time. You're right about it burning easily if the sun shines on it.

These plants don't usually lead very long lives in water. Like said above, they're not even from a swampy or wet environment. If you can collect rain water, your plant should like that better, whether in just water, or used to moisten soil. I put mine in a regular pot like any other house plant.

Well, I choose night as I have the vase in the living room, thus I wouldn't want the lamp on while here are guests around. And no, I don't expose the roots to air as I put them in the bucket of the resting water while cleaning the vase. So do I have to put them in pots else they'll die? Or there's another solution? Because I wouldn't want a pot in the living room, I guess that I'll plant them in a shadowed area in the garden if there's no other solution