Always have plenty of filtration , -"You can not have too much"- . I would recommend no more than 6 Red Belly in that footprint They can grow to 10" With the proper water care and diet .
I recommend feeding "http://www.drsfostersmith.com/product/prod_display.cfm?pcatid=4476 " As a staple diet and also get them to eat " http://www.thatpetplace.com/spectru..._id=27402247&gclid=CM6aufuhtL8CFQoKaQodL7QAhA "
DO Not feed live food like gold fish , Maybe every blue moon buy them live food . Heavy water changes every week Piranha are messy eaters .
I recommend feeding "http://www.drsfostersmith.com/product/prod_display.cfm?pcatid=4476 " As a staple diet and also get them to eat " http://www.thatpetplace.com/spectru..._id=27402247&gclid=CM6aufuhtL8CFQoKaQodL7QAhA "
DO Not feed live food like gold fish , Maybe every blue moon buy them live food . Heavy water changes every week Piranha are messy eaters .