In my sig you will see what I have in my long 20g and one of the long finned black tetras has been acting really sluggish and has isloated it self from the other fish by going to the upper half of the tank and his eyes look different from the other tetras, it kinda looks like popeye because they are sticking out a little bit and look swollen. Also like the said the other tetras eyes look normal and regular shape and are in the right place on the body. So should I treat the tank for popeye even though I'm not 100% positive it is or should I wait and see if the eyes protude out any further or other tetras start looking like this?