i think peacocks do better in groups. I have a very densely planted, sandy bottomed tank with about 3 different caves, with one eel i occasionally saw his head, with two they both come out at night and play around, i now have a small fire eel (smaller than the peacocks) and now none of them ever burrow. i was worried about adding eels but they seem to love eachother. the peacocks pop out of the sand right next to eachother and the fire eel lurks around pretty close, he never burrows