White spot on my tang

[Richard]

Lymphocystis. It's caused by a virus so meds won't help. Just keep the water quality high and feed him well (he is pretty skinny) and it'll go away.

Also keep the temp stable. Like every year, lot's of diseases showing up with the warm then cool then warm weather. Stress (water quality, poor nutrition, unstable temps, etc.) is what causes most diseases.