what is this on my porcupine puffer

ponyta810

Member
picked up a porc puffer and he look great in the store healthy, heppy and i watched them feed him but then when i brought him home and put him in my qt he was swimming wierd his tail was floating up higher than the rest of him and he was in a vertical position. i fed him again last night and turned the lights off and when today i turned the lights back on i noticed something underneath his fin, but he is swimming better today but will sometimes go back to how he was yester day
sorry camerphone pic but its under the fin if u cant identify what it is please tell me
 
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