Like someone stated above, i think being in a 55 makes them very jittery as well. They are aware of how much space they do and DON'T have to hide. When my dempseys were in the 125 they would be out and about. When they started breeding and I gave them their own 55, it was like the downgrade in space made them feel more vulnerable, and they hid constantly. I gave them away to a friend with a 200 and another pair of dempseys and all four of them "school" around together, although the one I gave him is still prone to hiding sometimes.