This question is for goodwin only because of the number of tangs in his tank but anyone feel free to answer. I have 3 yellow tangs. They suffered from HLLE because I was ignorant and was unaware of the nutritional requirements of tangs. On a scale from 1-10, 1 = least HLLE, 10 = most HLLE, one fish was a 1 one was a 5 one was a 10. I have had them all about the same amount of time. Aprox a year. I have been adding marine vitamin C to there food and giving them brocolli, which they devour. The 1 and the 5 are back to basically perfect. The 10 however, still has some paleness on his face and his color is not comming back. I have been treating for about 3 months and feeding the brocolli for about 2 weeks (brocolli had the fastest and most impressive effect. Vit C almost nothing). My question is how long does it take for a tang to heal or is it a permanant scar and the fish is probably as healthy as it is going to get?