Do you have any idea what ick is? Pls give some info on the tank. Other inhabitants. How long you've had the tang - and the tank. Water readings.
Also, look up info on the use of quarantine tanks.
BTW, I admire anyone that can do hippos since they seem to be ick magnets. I'm chicken.
"Life may not be the party we hoped for but while we are here we might as well dance!"