GobyGuy--there really isn't much that can be done to change the behavior of a fish without changing the tank dynamics completely. Mine could now reign the upper levels of the tank all day, but still choose not to come out much when the lights are on. I do know that a couple buddies will make them more comfortable and social, but can't gaurantee anything, and of course if you have top level fish already, they are probably making the UDC nervous. Mine only come out when the lights--all lights, not just the tank lights--are off.
You may want to consider replacing the UDC with a similar looking cat that is more social. I think lace cats might work--similar color pattern, a bit smaller, and less nocturnal. Of course, they don't swim upside down...
You may want to consider replacing the UDC with a similar looking cat that is more social. I think lace cats might work--similar color pattern, a bit smaller, and less nocturnal. Of course, they don't swim upside down...