new fish is acting funny

Apr 30, 2004
60
0
0
42
greenville, sc
#1
got a new carnival fish the other night. He looked healthy. when i got him home, already had his tank set up, i released him and ever since hes been flashing and jerking and acting very stressed out. Water conditions are good and theres good bacteria in the tank, but still dont know whats bothering him. i noticed yesterday he has one small white spot on the tip of his ventral ? fin.
( the bottom back fin) its just one spot though for almost two days. kind of looks to big to be ick, and not really like a fungus. anyone have an idea what he has so i can treat it. Im going to do a salt bath on him tonight just incase. opinions are greatly appriciated, thank you.