I recently received a Red Texas fry that I ordered 3 days ago and he has not stopped heavily breathing ever since, My water has plenty of aeration and the water parameters are fine, Temp is 78 and my water is pretty clean. He is housed with one American Datnoid and 5 Silver Dollars. I anything stressing him out? He is opening and closing his mouth very fast and opening and closing his gills rapidly as well. He has been swimming around normally and is eating Blood Worms fine I just don't understand what's wrong with him
I really would appreciate some help!!!

Edit: Oh and he is about 3"

Edit: Oh and he is about 3"