The O's love their new 8' home. Lots of room for chasing each other. I had to move my O into another 5' tank for a while. He wasn't having any new comers in his space. He had all 4 of the new guys pinned into a corner within a few minutes even though they were the same size as he is. The Lima is doing great. I put him in yet another 5' tank with my tsn and they are now buddies. They cruze the tank together and play.