Yes, definately HLLE. Follow the advise given above, and add a grounding probe to your tank as well as your sump if you have one.
Start offerring this fish a lot of greens such as Seaweed Selects, as well as a good variety of meaty foods. You can add zeocon to the meaty foods which is good for HLLE. Meals at least 3x a day in addition to leafs of seaweed.
What size tank do you have? Do you have LR? What are your water readings, including nitrate?