can anyone diagnose?

[dirk_brijs]

can someone point me to the right direction fo what this could be on our yellow belly...
Thing is no other fish ion the tank is showing anything similar...
could it be sand particles stuck to its skin or should I be worried?

 

[flfireman1]

Need more info. New fish? How long in the aquarium?


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[dirk_brijs]

not a new fish
in the tank from the beginning...over a year now