HELP HELP HELP with yellow tang

[Aquattro]

boys, take the arguing back and forth to PM please.

I think a YT in a 46 is reasonable, although they are not what I'd call susceptible to disease. I had my YT for 8 years and it never got sick, even when it was in a 45g tank.
Sailfins in 33g tanks is pushing it, since they can grow much larger than a yellow.

Make sure the temp is stable, all water parameters are acceptable and feed a good selection of food, including garlic soaked nori and the YT should be fine.