hi,
My yellow tang is hypervenolating at the bottom of my aquarium. i looked to find a white stripe going across its stomach. What can this be and will it spread?
The white stripe is nothing to be alarmed at. It's a stress coloration and you'll often see it when the lights first come on in the morning. The heavy breathing could be a concern. Is anything chasing/harassing the tang? Are your water parameters in check?