i have a 2" pacu in a ten gallon with a 1/2" baby red belly......... i have the baby in there until my 20 is done cycling........ does my pacu pose a threat to my red belly??? i have some gold fish in there with them. should i move the pacu????
Pacu's are not as dangerous as piranhas but size alone could be the downfall. If its mouth is big enough to eat the baby piranha then I would say it is a serious risk if the pacu decides to attack. I would recommend something larger than a 20 gallon for your baby if you plan on keeping it in there longer than a few months as it will outgrow that tank very quickly.