what I would do is, get a peice of plexi-glass the width of the tank,slip it in there in the middle or hopefully they will all be to a corner and put it there..even if you put it in the middle you cut the tanks size in half,this makes for less hiding spots..I would also take the lr out of the side the fish are on..hopefully they will be on the same side as each other,its just easier in the long run and its not that hard,had to do it a couple of times on my own and it seem less disturbing than trying to chase a fish back and forth a 6-7ft. tank IMO