vampire shrimp

Can a UV sterilizer be used in an aquarium with bamboo and vampire shrimp or will this affect the micro organisms they eat?

I purchased cardinal tetras two weeks ago and noticed a small spot on one in the beginning but thought he had just got scratched on something however several have it now and it's definitely fungus. I have a vampire shrimp, bristlenose pleco, and Kuhli loaches in the aquarium with them however...