I did run carbon, maybe a couple of cups. I'm not sure if it was the cause of the HLLE though. During that time, I didn't soak my foods, so that could be it too. The HLLE came on really fast, but it doesnt look like it is getting any worse.
I've been doing A LOT of big WC since noticing the HLLE and have been soaking my food. Removed carbon, but just recently put it back b/c my water was getting way too cloudy soaking food with A LOT of Zoecon/Selecon. I've been adding Kent's essential elements about twice a week too.
Its mainly just the pomacanthus angels(Blueface/Passer/Chrysurus) that has the HLLE. I've seen one guy said he's had 3-4 emperors, and they all had HLLE.
They were all treated with cupramine and I have seen my angels get HLLE during Cupramine before. But these fish were HLLE free when they entered my DT.
Too many variables involved for me say what definitely caused the HLLE...
Its really holding me back from doing a big upgrade though.
Thanks for the suggestions.