My pacu are all nippy, even with 30" cats and aros.. i just dont see a paroon being that much of a fish killer/eater for a long time. Any i.d. shark ive owned always gets picked on and are very placid fish even at 20". I'd wager an appropriate sized aro or gar maybe for up top and some geos or larger barbs to keep it interesting. Tinfoils arent that bad to look at lol...and there cheap if they do get eaten.
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