my freddies are a bonded pair,if i separate them they go crazy on their tankmates until i put them back together. when they are togther they are side by side all the time they even sleep in the flower pot togother at night. In my experience i noticed if you raised ca's in a community tank they bond stronger,if you rasise them with no tank mates they tend to be less bonded. I guess with no tank mates there is no reason to bond strong,nothing to gaurd against.