HEAD & LATERAL LINE EROSION (HILLE)
Symptoms
Discoloration of fish; white or gray fading of the color in patches
Large non-bleeding ulcers
Superficial erosion on the head and face
Head and lateral line erosion (HILLE), also known as hole-in-the-head (HITH) disease, is common in both freshwater and saltwater fish. HILLE is a chronic condition that creates lesions along the lateral line (the pores that run along both sides of your fish).
Although, HILLE is usually non-fatal, the disease does leave behind permanent scarring on your fish’s skin.
Treatment
Removing all activated carbon
Performing large percentage (90%) water changes
Increasing nutrition with quality frozen food and vitamins
Remove any stray voltage, use a grounding probe