YT's are very susceptible to HLLE
though - you have to keep a good herbivore diet going for them - seaweed, etc., otherwise they'll wither away. I think blue's are susceptible to this as well, but it seems to show more on yellow's.
It makes me sick to go into a pet store and see a tank full of sickly looking, pale, skinny YT's. I always want to take them home and fatten them up, but I know that's not a solution (supporting chain stores that have no business carrying sensitive species).
Before I got nori, mine was starting to develope some lateral line erosion, and a little erosion between the eyes and gills. Once I got a some nori, it started clearing up. Beyond that, he's had a minor problem with black ich, which was easily cleared up with FW
dips and never returned. He's never had white spots/ich/etc, even though my blue tang does get a couple spots now and then. The blue seems much more sensitive than the yellow.
180G build thread
180G All-glass with dual megaflows in a custom stand
AquaC EV-180 skimmer
250 pounds LR
160 pounds aragonite
Custom acrylic sump from GlassCages.com
2xPCX-40 return pumps
2x250MH 14K, 2x175MH 14K - PFO lighting, 2x65W PC
No-name 36W UV
Water General 125GPH RO/DI