I JUST SEPARATED MY TANK PUT A MARM ON WACH SIDE AND THE ONE JOHANNA I PUT ON THE SIDE OF THE SMALLER MARM AND THEY ARE FINE NO FIGHTS THEY SWIM AROUND LIKE THEY ITS NOTHING... BUT MY OTHER MARM IS CRAZY.. BEATS THE HELL OUT OF BOTH OF THEM... I WENT TO WORK CAME BACK AND IT DUG UNDER THE DIVIDER TO GET TO THE OTHER SIDE...