ID this fish please

it's definitely not a silver dollar.
 
I'd say Pacu also.
 
Pacu is my guess. Any closeup pics? What's with its mouth?


I dont know i guess he bangs in to the glass?? ..this tank is in the basement, in the theater room and im rarely down there but just to feed him twice a day and weekly waterchange..guess he still gets startled.but he is being treated!:headbang2:
 
IM thinking a PACU too! but we will see and ill post more photos as he grows!
 
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