http://forum.aqua-fish.net/ A forum devoted to aquarium fish, plants, techniques and fish keeping as a whole. en http://forum.aqua-fish.net/?topic=moster-fish-what-is-it-help#1 Help we just got this new..."tinfoil" but ... it doesnt look like our other two. What is it? akfishhouse 2008-08-21 http://forum.aqua-fish.net/?topic=moster-fish-what-is-it-help#2 For me it looks like Pacu or Piranha. See them here: http://www.aqua-fish.net/show.php?h=pacu. I may be wrong because I have no experiences with these species. jan 2008-08-22 http://forum.aqua-fish.net/?topic=moster-fish-what-is-it-help#3 I agree with the first post. If Piranha then be concerned a little for your other fish, keep a watchful eye out for fin and tail munching which Piranha are noted for. Pacu, if my memory dos`nt fail me are fruit eaters. But my money is on Piranha. pikeman 2008-08-24 http://forum.aqua-fish.net/?topic=moster-fish-what-is-it-help#4 even with only looking at the first pic-piranha no doubt in my mind at all mickey 2008-08-27 http://forum.aqua-fish.net/?topic=moster-fish-what-is-it-help#5 This is was the 2 meanest species of pirahna look like attached below, the only thing i could find it resembled was a large silver dollar because of its face and 2 spots behind its eyes, i have never seen 1 with fins like that before but its definatly not a pirahna of pacu they look too differn't. Greenterror 2010-01-15 http://forum.aqua-fish.net/?topic=moster-fish-what-is-it-help#6 Guys, that is a pacu, not a piranha, there is no lower over bite and my pacu at home is a spitting image of his fish. a piranha of that size would be very distinctive and unmistakable. cyberseanx 2010-02-05