if you do not know the answer to the question asked then why would you all post?NO you cannot keep two fully grown rbp together.. 1 will pick on the other constantly.. and with piranha having the teeth that they do it can only meen death to the weeker one..you would rather keep either 1 or 3 or more.. even with three there will still be problems with aggression.. as for the flowerhorns.. they will get eaten, maybe not today or tommorow but when the piranha are hungry then say goodbye flowerhorns.. ohh and btw when asking about piranhs make sure your getting answers from users that actually own these fish..
anthony
anthony