Change the water! Get rid of the algae. Clean out the glass. Rinse the roots every time you change the water. Use very little fertilizer and very seldom.

how do i get rid of the algea? ohyton in the water? and this is newly changed water you are seeing in the pics ;-( the roots are green

It appears that the yellowing is starting above the place where the canes are tied together with something red. Loosen that tie or get rid of it altogether if you can.

I hate to say it, but if this were mine, I would cut the overgrown tops off completely, make several cane cuttings (propagate in good potting soil), and I would also let those new little shoots take over.

I don't know WHAT the heck is going on with that water, but a heavy growth of algae on the roots like that is not good for the survival of the plants.

By taking cuttings, you will be doing something proactive in keeping this plant going for many years. The way it's going now, you will simply be watching it decline steadily.

If you are interested in learning how to propagate this plant, let me know.

This Dracaena is a classic example of this plants capabilities to tolerate a wide range of culturing conditions. It's growth will be
impressive with an ideal favorable growing method.

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UPDATE: This plant is on its way back to health! Dorie thank you so much! I decided to cover all the bases, sterile agar, soil/peat/perlite/spag mixture and just plain old water. The soil mixture is producing the best results so far and fast!

Thanks to all for your help
Clara