that came to mind when the kole came down with it, so i soak all the frozen food over night in Zoa.. i think thats right...? huh also i heard about some other reasons for HLLE, carbon dust in the water...its get in their digestive system and can cause stress in turn leading to HLLE. Another one was just the stress factor alone, such as working in your tank...moving live rock, placing corals, just to much human interaction. This is strange though because ive seen tons of Tangs, i guess one example would be the one in the prop tank at Finaddict in SA. Im thinking its the same as mine just older because its more of a chocolate color, but that fish seems to love people. Not only that but my fish dont seem to bothered if im working in the tank. One thing though...im thinking the kole tang might have got it from the carbon, but even thats a little hard to believe. I always wash any carbon i use, and im not even using any now. ahhhh i dont get it. This sucks for sure! I guess the only thing i can do now is try a different food. Oh and im also feeding with Ocean N. F II as well.....blah If i cant cure this... NO MORE TANGS. any more ideas would be great! thanks again guys