sorry, the photo it doesn't show anything. Ick is easy to spot,the little white cysts resemble grains of salt. They can cover the body,and also their fins. The fish may only have two or three cysts, or it might be absolutely plastered in it. If indeed you suspect that your fish has got it, try turning the temperature of the tank up to around 30°C and leaving it like that for around 10 days. You can also treat the tank with a white spot treatment, this should kill any free swimming parasites. Hopefully, the heat treatment should do the trick. I would actually advise you not to treat the tank while the temperature is quite high, you can always add that after where it has come down a little bit, just to be on the face side.