i took the 2 larger one of the newer groupand put them together so far they are doing well...min. to no fights...the third is still to small yetand all three are to small to go with thelargest yet...also the smallest one jumpped out during a switch that the aros did themselves...it slipped out of my hands and hit the floor...it is doing good, just got alittle stuned, but it is fine now...i added a goldfish so the 2 aros that are together can beat on it other then eachother...