I am a little concerned about the stalk you snapped in half. Snapping is not good for the stalk. Instead you should have cut the stalk an inch above a node making sure that the section above and below are healthy and green. In the post We Are Not Always Lucky With Lucky Bamboo, I detail how and where to make the cuts and which parts will make new plants. If you follow the instructions, you should be able to propagate new lucky bamboo shoots for the diseased stalk. Be sure you place it in a different container than the other lucky bamboo stalks. Good Luck. Let me know if you need anything else.

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I don't think we are quite at the biohazard stage. But, I do think you have some type of fungal infection happening. The first thing, I would do is cut the mushy piece off. In fact, I would cut at least an inch past the yellow to make sure the fungus has been removed. Before you move to the next stalk drip your clippers in a bleach solution (1part bleach to 1part water). Hopefully this will keep the fungus from spreading. In the green stalk, cut off the section that has the red lesions. If you need instruction on how and where to make the cut go to We are not always lucky with lucky bamboo. It contains pictures and instructions. Good luck and keep me posted.

I left for 2 weeks, and came back to find the curly stalk yellow from the top halfway down. It was extremely squishy and almost moldy(?). After reading a few posts here it sounded like the best option was to cut the bad part off and let the stalk regrow, which is very upsetting since this is my only curly stalk :(.

Anyhow, as I was cutting it off I noticed some strange crusty red growths underneath where the leaves overlap. It looked very odd and made me suspect some kind of fungal infection. After cutting the stalk down, I checked my other stalk and it appears to have the same red growths underneath the overlaps of the leaves.

I've attached pictures of the yellow stalk I cut off and a picture of the red growths on my other stalk.

Any suggestions? Should I declare my desk a biohazard zone?

Thanks!

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Your city water system maybe adding more chlorine than usual to the water. Remove the stalk that is turning yellow. It will probably die, but you can place it in a container to itself to see if it will recover. Buy a jug of distilled water, empty the water in the lucky bamboo container and refill with the distilled water. Hopefully this will keep the other two stalks from turning yellow. If they start to turn, you will need to start new plants. Good Luck.