no way. It's an obvious answer. even though the rbps are the "least aggresive" piranhas around, it quite impossible to keep vertually fish as tankmate from getting seriously mauled or most likely killed. the only POSSIBLE tankmates for piranhas that might actually work are plecos (and arguably pbass, oscar, neon tetra). Check the sticky from the piraha forum sticky for more ideas. putting any bichir (anysize) in a piranha tank will be death eventually. a bichir would just be a next juicy meal?worm for them to eat. never take the chance for this!