Originally Posted by lion_crazz
Head and lateral line disease is caused by poor nutrition and poor water quality. There is no medication for this.
A bacterial infection is treated with improved water quality, as well as the use of an antibiotic.
HLLE can also be caused by stray voltage and stress as well . The tang does not appear to be suffering from HLLE disease, but the red blotches indicates either a bacterial infection and/or very poor water quality. Stress can also cause this . This is often a problem with QT tanks. THey are often too small and counter-productive.
Test the water parameters. Also, if you have a source of macroalgae this can often supply a source of natrual vitamins for your tangs. Also, make sure you have plenty water movement in your QT...a must for tangs.